Launches but Once In-game, Crashes

I see this:
"[10:38:54 FATAL]: Fatal error launching game. Report this to http://bugs.mojang.com please!
java.io.FileNotFoundException: File 'C:\Users\Travis\AppData\Roaming\.minecraft\assets\indexes\legacy.json' does not exist" along with
"
[10:39:19] [Server thread/INFO]: MibsNomCmgSbux[local:E:2644ee9d] logged in with entity id 222 at (273.9661872350983, 63.875, 147.90271660940442)
[10:39:19] [Server thread/INFO]: MibsNomCmgSbux joined the game
[10:39:19] [Server thread/INFO]: Saving and pausing game...
[10:39:19] [Server thread/INFO]: Saving chunks for level 'New World'/Overworld
[10:39:20] [Server thread/INFO]: Saving chunks for level 'New World'/Nether
[10:39:20] [Server thread/INFO]: Saving chunks for level 'New World'/The End
#

1. A fatal error has been detected by the Java Runtime Environment:
   #

2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00000000594d4b6e, pid=9076, tid=6328
   #

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. V [jvm.dll+0x394b6e]
   #

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\Travis\AppData\Roaming\.minecraft\hs_err_pid9076.log
   ". I cannot open this file on Windows 7, so I don't know what I can do right now/on my end.
   Please let me know what I can do.