After updating to the latest version of minecraft the game now crashes.
On the "Select World" menu "Unknown Version" is written beside each of the worlds that I have created before the present update. When any of these worlds are selected the program opens for a short period and then crashes. It creates a bug report:
Completely ignored arguments: [--nativeLauncherVersion, 307]
[19:32:02] [Client thread/INFO]: Setting user: Jarla
[19:32:06] [Client thread/WARN]: Skipping bad option: lastServer:
[19:32:06] [Client thread/INFO]: LWJGL Version: 2.9.4
[19:32:07] [Client thread/INFO]: Reloading ResourceManager: Default
[19:32:09] [Sound Library Loader/INFO]: Starting up SoundSystem...
[19:32:09] [Thread-5/INFO]: Initializing LWJGL OpenAL
[19:32:09] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
[19:32:10] [Thread-5/ERROR]: Error in class 'LibraryLWJGLOpenAL'
[19:32:10] [Thread-5/ERROR]: Unable to initialize OpenAL. Probable cause: OpenAL not supported.
[19:32:10] [Thread-5/WARN]: ERROR MESSAGE:
[19:32:10] [Thread-5/INFO]: Could not locate OpenAL library.
[19:32:10] [Thread-5/WARN]: STACK TRACE:
[19:32:10] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:156)
[19:32:10] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:102)
[19:32:10] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:206)
[19:32:10] [Thread-5/INFO]: paulscode.sound.libraries.LibraryLWJGLOpenAL.init(LibraryLWJGLOpenAL.java:164)
[19:32:10] [Thread-5/INFO]: paulscode.sound.SoundSystem.CommandNewLibrary(SoundSystem.java:1576)
[19:32:10] [Thread-5/INFO]: paulscode.sound.SoundSystem.CommandQueue(SoundSystem.java:2572)
[19:32:10] [Thread-5/INFO]: paulscode.sound.CommandThread.run(CommandThread.java:121)
[19:32:10] [Sound Library Loader/WARN]: ERROR MESSAGE:
[19:32:10] [Sound Library Loader/INFO]: Could not locate OpenAL library.
[19:32:10] [Sound Library Loader/INFO]: Starting up SoundSystem...
[19:32:10] [Thread-7/INFO]: Switching to No Sound
[19:32:10] [Thread-7/INFO]: (Silent Mode)
[19:32:10] [Sound Library Loader/INFO]: Sound engine started
[19:32:15] [Client thread/INFO]: Created: 1024x512 textures-atlas
[19:36:55] [Server thread/INFO]: Starting integrated minecraft server version 1.10.2
[19:36:55] [Server thread/INFO]: Generating keypair
[19:36:56] [Server thread/INFO]: Preparing start region for level 0
[19:36:57] [Server thread/INFO]: Preparing spawn area: 0%
[19:36:58] [Server thread/INFO]: Preparing spawn area: 21%
[19:36:59] [Server thread/INFO]: Preparing spawn area: 68%
[19:37:01] [Server thread/INFO]: Changing view distance to 12, from 10
[19:37:05] [Server thread/INFO]: Jarla[local:E:a761d03a] logged in with entity id 243 at (-150.02770619372, 71.0, -220.9782468627048)
[19:37:05] [Server thread/INFO]: Jarla joined the game
[19:37:10] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 5101ms behind, skipping 102 tick(s)
#

1. A fatal error has been detected by the Java Runtime Environment:
   #
2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffca357cf83, pid=5816, tid=5416
   #
3. JRE version: Java(TM) SE Runtime Environment (8.0_25-b18) (build 1.8.0_25-b18)
4. Java VM: Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode windows-amd64 compressed oops)
5. Problematic frame:
6. C [ig7icd64.dll+0x6cf83]
   #
7. Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
   #
8. An error report file with more information is saved as:
9. C:\Users\Alverna\AppData\Roaming\.minecraft\hs_err_pid5816.log
   Compiled method (c1) 323467 7519 2 bwn::a (11 bytes)
   total in heap [0x0000000002f1ed50,0x0000000002f1f6d0] = 2432
   relocation [0x0000000002f1ee70,0x0000000002f1ef00] = 144
   main code [0x0000000002f1ef00,0x0000000002f1f200] = 768
   stub code [0x0000000002f1f200,0x0000000002f1f2f8] = 248
   oops [0x0000000002f1f2f8,0x0000000002f1f300] = 8
   metadata [0x0000000002f1f300,0x0000000002f1f340] = 64
   scopes data [0x0000000002f1f340,0x0000000002f1f5b8] = 632
   scopes pcs [0x0000000002f1f5b8,0x0000000002f1f6a8] = 240
   dependencies [0x0000000002f1f6a8,0x0000000002f1f6b0] = 8
   nul chk table [0x0000000002f1f6b0,0x0000000002f1f6d0] = 32
   #
10. If you would like to submit a bug report, please visit:
11. http://bugreport.sun.com/bugreport/crash.jsp
12. The crash happened outside the Java Virtual Machine in native code.
13. See problematic frame for where to report the bug.
    #
    Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release