Minecraft Game Does Not Launch

I downloaded Minecraft and logged in. Clicked play and everything worked fine. The game launched and so on. When I closed Minecraft and went back on, the game would not launch. I would remain on the Minecraft Launcher window.

When I clicked 'Play', the Screen went off, then popped back on with the 'Mojang' icon on it, and then kick me back to the Launcher.
Never had this before.
I tried re-installing Minecraft and Java a few times, but it did not change anything.

This is the Development Console:

[11:35:58 INFO]: Finished downloading C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries': Local file matches local checksum, using that
[11:35:59 INFO]: Finished downloading C:\Users\Christiana_2\AppData\Roaming\.minecraft\versions\1.7.9\1.7.9.jar for job 'Version & Libraries': Used own copy as it matched etag
[11:35:59 INFO]: Job 'Version & Libraries' finished successfully (took 0:00:01.939)
[11:35:59 INFO]: Launching game
[11:35:59 INFO]: Unpacking natives to C:\Users\Christiana_2\AppData\Roaming\.minecraft\versions\1.7.9\1.7.9-natives-5323065352045
[11:35:59 INFO]: Launching in C:\Users\Christiana_2\AppData\Roaming\.minecraft
[11:35:59 INFO]: Half command: C:\Program Files\Java\jre7\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -Djava.library.path=C:\Users\Christiana_2\AppData\Roaming\.minecraft\versions\1.7.9\1.7.9-natives-5323065352045 -cp C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\15.0\guava-15.0.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.13\authlib-1.5.13.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\Christiana_2\AppData\Roaming\.minecraft\versions\1.7.9\1.7.9.jar net.minecraft.client.main.Main
[11:35:59 INFO]: Looking for orphaned versions to clean up...
[11:36:00 FATAL]: Fatal error launching game. Report this to http://bugs.mojang.com please!
java.io.FileNotFoundException: File 'C:\Users\Christiana_2\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:186) ~[launcher.jar:?]
	at net.minecraft.launcher.Launcher.performCleanups(Launcher.java:421) ~[launcher.jar:?]
	at net.minecraft.launcher.game.MinecraftGameRunner.launchGame(MinecraftGameRunner.java:217) ~[launcher.jar:?]
	at com.mojang.launcher.game.runner.AbstractGameRunner.onDownloadJobFinished(AbstractGameRunner.java:177) [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) [?:1.7.0_45]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_45]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_45]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_45]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_45]
[11:36:02 INFO]: Client> [11:36:02] [main/INFO]: Setting user: xTrollCatsx
[11:36:02 INFO]: Client> [11:36:02] [main/INFO]: (Session ID is token:d6c745864d8847cb8cef76a86bf6c5c9:1137967b02424737afeeeb41428cf498)
[11:36:03 INFO]: Client> [11:36:03] [Client thread/INFO]: LWJGL Version: 2.9.1
[11:36:07 INFO]: Client> [11:36:07] [Client thread/INFO]: Reloading ResourceManager: Default
[11:36:07 INFO]: Client> 
[11:36:07 INFO]: Client> Starting up SoundSystem...
[11:36:07 INFO]: Client> Initializing LWJGL OpenAL
[11:36:07 INFO]: Client>     (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[11:36:07 INFO]: Client> OpenAL initialized.
[11:36:08 INFO]: Client> 
[11:36:08 INFO]: Client> [11:36:08] [Sound Library Loader/INFO]: Sound engine started
[11:36:10 INFO]: Client> [11:36:10] [Client thread/INFO]: Created: 512x256 textures/blocks-atlas
[11:36:11 INFO]: Client> [11:36:11] [Client thread/INFO]: Created: 256x256 textures/items-atlas
[11:36:12 INFO]: Client> #
[11:36:12 INFO]: Client> # A fatal error has been detected by the Java Runtime Environment:
[11:36:12 INFO]: Client> #
[11:36:12 INFO]: Client> #  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000000b17ee1f, pid=800, tid=4584
[11:36:12 INFO]: Client> #
[11:36:12 INFO]: Client> # JRE version: Java(TM) SE Runtime Environment (7.0_45-b18) (build 1.7.0_45-b18)
[11:36:12 INFO]: Client> # Java VM: Java HotSpot(TM) 64-Bit Server VM (24.45-b08 mixed mode windows-amd64 compressed oops)
[11:36:12 INFO]: Client> # Problematic frame:
[11:36:12 INFO]: Client> # C  [ig4icd64.dll+0x3ee1f]
[11:36:12 INFO]: Client> #
[11:36:12 INFO]: Client> # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
[11:36:12 INFO]: Client> #
[11:36:12 INFO]: Client> # An error report file with more information is saved as:
[11:36:12 INFO]: Client> # C:\Users\Christiana_2\AppData\Roaming\.minecraft\hs_err_pid800.log
[11:36:12 INFO]: Client> #
[11:36:12 INFO]: Client> # If you would like to submit a bug report, please visit:
[11:36:12 INFO]: Client> #   http://bugreport.sun.com/bugreport/crash.jsp
[11:36:12 INFO]: Client> # The crash happened outside the Java Virtual Machine in native code.
[11:36:12 INFO]: Client> # See problematic frame for where to report the bug.
[11:36:12 INFO]: Client> #
[11:36:12 INFO]: Client> AL lib: (EE) alc_cleanup: 1 device not closed
[11:36:12 ERROR]: Game ended with bad state (exit code 1)
[11:36:12 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[11:36:12 INFO]: Deleting C:\Users\Christiana_2\AppData\Roaming\.minecraft\versions\1.7.9\1.7.9-natives-5323065352045
[11:36:12 WARN]: Couldn't delete C:\Users\Christiana_2\AppData\Roaming\.minecraft\versions\1.7.9\1.7.9-natives-5323065352045 - scheduling for deletion upon exit

Help would be appreciated. This is very frustrating.