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I've never gotten this error before until 1.8, it might have something to do with it. Everything works for a few seconds after launching a world, but then it suddenly crashes and i get this error:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x2a90c6ae, pid=9476, tid=13160
#
# JRE version: 7.0_09-b05
# Java VM: Java HotSpot(TM) Client VM (23.5-b02 mixed mode windows-x86 )
# Problematic frame:
# C 0x2a90c6ae
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# MyDirectory:)\.minecraft\hs_err_pid9476.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
AL lib: (EE) alc_cleanup: 1 device not closed



The log it referred to said this

#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x2a90c6ae, pid=9476, tid=13160
#
# JRE version: 7.0_09-b05
# Java VM: Java HotSpot(TM) Client VM (23.5-b02 mixed mode windows-x86 )
# Problematic frame:
# C 0x2a90c6ae
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

--------------- T H R E A D ---------------

Current thread (0x008bc800): JavaThread "Client thread" [_thread_in_native, id=13160, stack(0x00550000,0x005a0000)]

siginfo: ExceptionCode=0xc0000005, reading address 0x00000008

Registers:
EAX=0x0000000c, EBX=0x00000004, ECX=0x00000003, EDX=0x00000000
ESP=0x0059f650, EBP=0x0000000c, ESI=0x00000008, EDI=0x3a1cbc24
EIP=0x2a90c6ae, EFLAGS=0x00010206

Top of Stack: (sp=0x0059f650)
0x0059f650: 008bc800 2b0a007c 0059f820 00000000
0x0059f660: 75d0c5bd 00000000 00000000 39e5247c
0x0059f670: 00000000 0059f69c 3a26117c 00000100
0x0059f680: 00000000 2b0a007c 00000001 00000400
0x0059f690: 0000036c 3a261074 2b0a11c4 3a1cbc24
0x0059f6a0: 3a1cbc24 00000000 00000000 00000000
0x0059f6b0: 00000000 00000000 00000000 00000000
0x0059f6c0: 00000000 00000000 00000000 00000000

Instructions: (pc=0x2a90c6ae)
0x2a90c68e: 94 50 c1 e0 04 8b a8 48 25 c8 2a 8b 80 44 25 c8
0x2a90c69e: 2a 8b cd 8d 74 18 04 8b c1 c1 e9 02 89 7c 24 4c
0x2a90c6ae: f3 a5 8b c8 83 e1 03 f3 a4 8b 4c 24 4c 03 cd 85
0x2a90c6be: d2 8b 6c 24 34 89 4c 94 50 75 93 8b 44 24 40 8b


Register to memory mapping:

EAX=0x0000000c is an unknown value
EBX=0x00000004 is an unknown value
ECX=0x00000003 is an unknown value
EDX=0x00000000 is an unknown value
ESP=0x0059f650 is pointing into the stack for thread: 0x008bc800
EBP=0x0000000c is an unknown value
ESI=0x00000008 is an unknown value
EDI=0x3a1cbc24 is an unknown value



Now when I launch 1.7 it says this:

Java HotSpot(TM) Client VM warning: CMS bit map backing store failure
Java HotSpot(TM) Client VM warning: Failed to allocate CMS Bit Map
Error occurred during initialization of VM
Could not create CMS collector



If you know what's going on, help is very appreciated.