1 BSOD and many random freeze(30 sec to 1 Min)

Microsoft (R) Windows Debugger Version 6.12.0002.633 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.


Loading Dump File [C:\Users\Kemeros\Desktop\080210-13478-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available

Symbol search path is: SRV*c:\symbols*
Executable search path is: 
Windows 7 Kernel Version 7600 MP (6 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7600.16539.amd64fre.win7_gdr.100226-1909
Machine Name:
Kernel base = 0xfffff800`02e5b000 PsLoadedModuleList = 0xfffff800`03098e50
Debug session time: Mon Aug  2 15:23:17.180 2010 (UTC - 4:00)
System Uptime: 0 days 3:07:31.162
Loading Kernel Symbols
...............................................................
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Loading User Symbols
Loading unloaded module list
....
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*                        Bugcheck Analysis                                    *
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Use !analyze -v to get detailed debugging information.

BugCheck 1A, {5003, fffff90000812000, fd2, fffff900c2c33009}

Probably caused by : win32k.sys ( win32k!memset+b0 )

Followup: MachineOwner
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1: kd> !analyze -v
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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
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MEMORY_MANAGEMENT (1a)
    # Any other values for parameter 1 must be individually examined.
Arguments:
Arg1: 0000000000005003, The subtype of the bugcheck.
Arg2: fffff90000812000
Arg3: 0000000000000fd2
Arg4: fffff900c2c33009

Debugging Details:
------------------


BUGCHECK_STR:  0x1a_5003

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

PROCESS_NAME:  firefox.exe

CURRENT_IRQL:  0

TRAP_FRAME:  fffff8800376f020 -- (.trap 0xfffff8800376f020)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=fffff900c2a00000 rbx=0000000000000000 rcx=fffff900c2f45000
rdx=0000000000000000 rsi=0000000000000000 rdi=0000000000000000
rip=fffff96000143c10 rsp=fffff8800376f1b8 rbp=0000000000000001
 r8=0000000000000004  r9=0000000000000432 r10=000000000000007f
r11=0000000000000034 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei pl nz na pe nc
win32k!memset+0xb0:
fffff960`00143c10 480fc311        movnti  qword ptr [rcx],rdx ds:0001:fffff900`c2f45000=????????????????
Resetting default scope

LAST_CONTROL_TRANSFER:  from fffff80002f3ad98 to fffff80002ecb600

STACK_TEXT:  
fffff880`0376ecb8 fffff800`02f3ad98 : 00000000`0000001a 00000000`00005003 fffff900`00812000 00000000`00000fd2 : nt!KeBugCheckEx
fffff880`0376ecc0 fffff800`02ee7b82 : 00000000`00000001 fffff900`c2f45000 fffff880`0376f020 fffff6fc`80617a28 : nt! ?? ::FNODOBFM::`string'+0x29f97
fffff880`0376edb0 fffff800`02ee5bd1 : 00000000`00090570 fffff900`c2af3000 00000000`00000000 00000000`00000004 : nt!MiDispatchFault+0x8c2
fffff880`0376eec0 fffff800`02ec96ee : 00000000`00000001 fffff900`c2a00000 00000000`35316800 00000000`00555c84 : nt!MmAccessFault+0x8f1
fffff880`0376f020 fffff960`00143c10 : fffff960`00132a12 fffff900`c01e6cf0 00000000`00000000 fffff960`00276ffc : nt!KiPageFault+0x16e
fffff880`0376f1b8 fffff960`00132a12 : fffff900`c01e6cf0 00000000`00000000 fffff960`00276ffc fffff960`00144215 : win32k!memset+0xb0
fffff880`0376f1c0 fffff960`00133f2b : 00000000`00000000 fffff880`0376f360 00000000`00000001 fffff960`001315e6 : win32k!AllocateObject+0xf2
fffff880`0376f200 fffff960`0010b4a4 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : win32k!SURFMEM::bCreateDIB+0x1fb
fffff880`0376f2f0 fffff960`0010b01e : 00000381`00000617 00000000`00000381 00000000`010809c7 00000000`00000617 : win32k!hsurfCreateCompatibleSurface+0x3bc
fffff880`0376f3c0 fffff800`02eca853 : fffffa80`03b9a060 fffff880`0376f520 00000000`00000000 fffff900`c00d2280 : win32k!GreCreateCompatibleBitmap+0x26e
fffff880`0376f4a0 00000000`75232dd9 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiSystemServiceCopyEnd+0x13
00000000`0016d2b8 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : 0x75232dd9


STACK_COMMAND:  kb

FOLLOWUP_IP: 
win32k!memset+b0
fffff960`00143c10 480fc311        movnti  qword ptr [rcx],rdx

SYMBOL_STACK_INDEX:  5

SYMBOL_NAME:  win32k!memset+b0

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: win32k

IMAGE_NAME:  win32k.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  4bdc4376

FAILURE_BUCKET_ID:  X64_0x1a_5003_win32k!memset+b0

BUCKET_ID:  X64_0x1a_5003_win32k!memset+b0

Followup: MachineOwner
---------