The area which normally displays on the entire screen is in a tiny square in the bottom right hand corner of the window. If I click the icon on the taskbar, the game closes and the development console has the following text:
Launching game
Looking for old natives to clean up...
Unpacking natives to C:\Users\User\AppData\Roaming\.minecraft\versions\13w38a\13w38a-natives-531631861470
Launching in C:\Users\User\AppData\Roaming\.minecraft
Running C:\Program Files\Java\jre7\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -Djava.library.path=C:\Users\User\AppData\Roaming\.minecraft\versions\13w38a\13w38a-natives-531631861470 -cp C:\Users\User\AppData\Roaming\.minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\14.0\guava-14.0.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\User\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\User\AppData\Roaming\.minecraft\versions\13w38a\13w38a.jar net.minecraft.client.main.Main --username Xilverbullet000 --session token:026e090c2c98497191a6fa0a834fbb93:1c50f17700f34a42bc6318d05c3c6056 --version 13w38a --gameDir C:\Users\User\AppData\Roaming\.minecraft --assetsDir C:\Users\User\AppData\Roaming\.minecraft\assets --uuid 1c50f17700f34a42bc6318d05c3c6056 --accessToken 026e090c2c98497191a6fa0a834fbb93 --width 1024 --height 1280
Client> 2013-09-19 19:00:03 [CLIENT] [INFO] Setting user: Xilverbullet000
Client> 2013-09-19 19:00:03 [CLIENT] [INFO] (Session ID is token:026e090c2c98497191a6fa0a834fbb93:1c50f17700f34a42bc6318d05c3c6056)
Client> 2013-09-19 19:00:04 [CLIENT] [INFO] LWJGL Version: 2.9.0
Client> 2013-09-19 19:00:04 [CLIENT] [INFO] Reloading ResourceManager: Default
Client>
Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client> (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client>
Client> #
Client> # A fatal error has been detected by the Java Runtime Environment:
Client> #
Client> # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000000bfc04c4, pid=4440, tid=4816
Client> #
Client> # JRE version: 7.0_04-b22
Client> # Java VM: Java HotSpot(TM) 64-Bit Server VM (23.0-b21 mixed mode windows-amd64 compressed oops)
Client> # Problematic frame:
Client> # C [ig4icd64.dll+0x6904c4] ShCompile+0x131774
Client> #
Client> # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
Client> #
Client> # An error report file with more information is saved as:
Client> # C:\Users\User\AppData\Roaming\.minecraft\hs_err_pid4440.log
Client> #
Client> # If you would like to submit a bug report, please visit:
Client> # http://bugreport.sun.com/bugreport/crash.jsp
Client> # The crash happened outside the Java Virtual Machine in native code.
Client> # See problematic frame for where to report the bug.
Client> #
Client> AL lib: (EE) alc_cleanup: 1 device not closed
Game ended with bad state (exit code 1)
Ignoring visibility rule and showing launcher due to a game crash
Deleting C:\Users\User\AppData\Roaming\.minecraft\versions\13w38a\13w38a-natives-531631861470
Couldn't delete C:\Users\User\AppData\Roaming\.minecraft\versions\13w38a\13w38a-natives-531631861470 - scheduling for deletion upon exit

I have a Windows 7 PC