Was operating minecraft fine for a while, but recently have experienced issue killing mobs. Killing any mob in single player or multiplayer causes the game to freeze completely. Have to ctrl+alt+delete and task manager quit the program. Please help.

Here is the text from the Launcher Log.

"
[21:39:48 INFO]: Minecraft Launcher 1.5.3 (through bootstrap 5) started on windows...
[21:39:48 INFO]: Current time is Dec 2, 2014 9:39:48 PM
[21:39:48 INFO]: System.getProperty('os.name') == 'Windows 7'
[21:39:48 INFO]: System.getProperty('os.version') == '6.1'
[21:39:48 INFO]: System.getProperty('os.arch') == 'x86'
[21:39:48 INFO]: System.getProperty('java.version') == '1.8.0_25'
[21:39:48 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[21:39:48 INFO]: System.getProperty('sun.arch.data.model') == '32'
[21:39:49 INFO]: JFX is already initialized
[21:39:51 INFO]: Refreshing local version list...
[21:39:52 INFO]: Refreshing remote version list...
[21:39:52 INFO]: Refresh complete.
[21:39:55 INFO]: Loaded 3 profile(s); selected 'Freeshia'
[21:39:55 INFO]: Refreshing auth...
[21:39:55 INFO]: Logging in with access token
[21:40:13 INFO]: Getting syncinfo for selected version
[21:40:13 INFO]: Queueing library & version downloads
[21:40:14 INFO]: Download job 'Version & Libraries' started (16 threads, 31 files)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\6.5\twitch-6.5.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.7.4\realms-1.7.4.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch-external-platform\4.5\twitch-external-platform-4.5-natives-windows-32.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar for job 'Version & Libraries'... (try 0)
[21:40:14 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Download job 'Resources' skipped as there are no files to download
[21:40:22 INFO]: Job 'Resources' finished successfully (took 0:00:00.000)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.7.4\realms-1.7.4.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch-platform\6.5\twitch-platform-6.5-natives-windows-32.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch-external-platform\4.5\twitch-external-platform-4.5-natives-windows-32.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.17\authlib-1.5.17.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\6.5\twitch-6.5.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.1\lwjgl-platform-2.9.1-natives-windows.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Attempting to download C:\Users\Co\AppData\Roaming\.minecraft\versions\1.8.1\1.8.1.jar for job 'Version & Libraries'... (try 0)
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.17\authlib-1.5.17.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:22 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:23 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:23 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:23 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:23 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.1\lwjgl-platform-2.9.1-natives-windows.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:23 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:23 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch-platform\6.5\twitch-platform-6.5-natives-windows-32.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:23 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:23 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:40:24 INFO]: Finished downloading C:\Users\Co\AppData\Roaming\.minecraft\versions\1.8.1\1.8.1.jar for job 'Version & Libraries': Used own copy as it matched etag
[21:40:24 INFO]: Job 'Version & Libraries' finished successfully (took 0:00:10.280)
[21:40:24 INFO]: Launching game
[21:40:24 INFO]: Unpacking natives to C:\Users\Co\AppData\Roaming\.minecraft\versions\1.8.1\1.8.1-natives-526714454384
[21:40:24 INFO]: Launching in C:\Users\Co\AppData\Roaming\.minecraft
[21:40:24 INFO]: Half command: C:\Program Files (x86)\Java\jre1.8.0_25\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -Djava.library.path=C:\Users\Co\AppData\Roaming\.minecraft\versions\1.8.1\1.8.1-natives-526714454384 -cp C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.17\authlib-1.5.17.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.7.4\realms-1.7.4.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\Co\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\6.5\twitch-6.5.jar;C:\Users\Co\AppData\Roaming\.minecraft\versions\1.8.1\1.8.1.jar net.minecraft.client.main.Main
[21:40:24 INFO]: Looking for orphaned versions to clean up...
[21:40:24 FATAL]: Fatal error launching game. Report this to http://bugs.mojang.com please!
java.io.FileNotFoundException: File 'C:\Users\Co\AppData\Roaming\.minecraft\assets\indexes\legacy.json' does not exist
at org.apache.commons.io.FileUtils.openInputStream(FileUtils.java:299) ~[launcher.jar:?]
at org.apache.commons.io.FileUtils.readFileToString(FileUtils.java:1711) ~[launcher.jar:?]
at net.minecraft.launcher.Launcher.cleanupOrphanedAssets(Launcher.java:252) ~[launcher.jar:?]
at net.minecraft.launcher.Launcher.performCleanups(Launcher.java:494) ~[launcher.jar:?]
at net.minecraft.launcher.game.MinecraftGameRunner.launchGame(MinecraftGameRunner.java:221) ~[launcher.jar:?]
at com.mojang.launcher.game.runner.AbstractGameRunner.onDownloadJobFinished(AbstractGameRunner.java:185) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:122) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_25]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_25]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
[21:41:50 ERROR]: Game ended with bad state (exit code -805306369)
[21:41:50 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[21:41:50 INFO]: Deleting C:\Users\Co\AppData\Roaming\.minecraft\versions\1.8.1\1.8.1-natives-526714454384
[21:41:50 WARN]: Couldn't delete C:\Users\Co\AppData\Roaming\.minecraft\versions\1.8.1\1.8.1-natives-526714454384 - scheduling for deletion upon exit
"