crashes

When i start my minecraft 1.8 evry world (multiplayer or singleplayer) just keeps crashing and giving me this report:
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Sometimes i also get this report:
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1. A fatal error has been detected by the Java Runtime Environment:
   #

2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000001abcad95, pid=6448, tid=4444
   #

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+0x6ad95]
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7. Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
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   [17:36:20] [Server thread/INFO]: [@: Given Saturation (ID 23) * 1 to masterqyu for 6 seconds]

8. An error report file with more information is saved as:

9. C:\Users\quintin\AppData\Roaming\.minecraft\hs_err_pid6448.log
   [17:36:20] [Server thread/INFO]: [@: Set score of running for player masterqyu to 0]
   #

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.
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Can anyone help me with this?