Constant BSOD/Crashing

Hi,

My pc crashes pretty much every time I play a game.
Battlefield Bad Company 2 and Crysis crash after ~5-20 minutes of gameplay.
COD:MW2 crashes after random amounts of time 1 hour+ usually.

I was wondering if any of you can tell me what you make of this mini dump!

Code:

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


Loading Dump File [C:\Windows\Minidump\090510-24960-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available

Symbol search path is: SRV*c:\symbols*http://msdl.microsoft.com/download/symbols
Executable search path is: 
Windows 7 Kernel Version 7600 MP (2 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7600.16617.amd64fre.win7_gdr.100618-1621
Machine Name:
Kernel base = 0xfffff800`02c01000 PsLoadedModuleList = 0xfffff800`02e3ee50
Debug session time: Sun Sep  5 19:52:33.207 2010 (UTC + 1:00)
System Uptime: 0 days 8:10:21.720
Loading Kernel Symbols
...............................................................
................................................................
...............................
Loading User Symbols
Loading unloaded module list
.........
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 10E, {1f, fffff8a00bea1e50, 0, 2c445f}

Probably caused by : dxgmms1.sys ( dxgmms1!VIDMM_GLOBAL::ReferenceAllocationForSubmission+148 )

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

1: kd> !analyze -v
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

VIDEO_MEMORY_MANAGEMENT_INTERNAL (10e)
The video memory manager encountered a condition that it can't recover from. By crashing,
the video memory manager is attempting to get enough information into the minidump such that
somebody can pinpoint what lead to this condition.
Arguments:
Arg1: 000000000000001f, The subtype of the bugcheck:
Arg2: fffff8a00bea1e50
Arg3: 0000000000000000
Arg4: 00000000002c445f

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


BUGCHECK_STR:  0x10e_1f

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

PROCESS_NAME:  System

CURRENT_IRQL:  0

LAST_CONTROL_TRANSFER:  from fffff88000c8022f to fffff80002c71740

STACK_TEXT:  
fffff880`036d6878 fffff880`00c8022f : 00000000`0000010e 00000000`0000001f fffff8a0`0bea1e50 00000000`00000000 : nt!KeBugCheckEx
fffff880`036d6880 fffff880`03e21098 : fffff8a0`096a58d0 fffff8a0`0bea1e50 00000000`002c445f 00000000`00000000 : watchdog!WdLogEvent5+0x11b
fffff880`036d68d0 fffff880`03e1e8af : 00000000`00000000 fffffa80`04557308 00000000`00000c3a fffffa80`073e2920 : dxgmms1!VIDMM_GLOBAL::ReferenceAllocationForSubmission+0x148
fffff880`036d6910 fffff880`03e3865d : 00000000`00000000 fffff8a0`0cd59930 fffffa80`00000000 fffffa80`040c9900 : dxgmms1!VIDMM_GLOBAL::PrepareDmaBuffer+0xe1b
fffff880`036d6ae0 fffff880`03e38398 : fffff800`040fa080 fffff880`03e37d00 fffffa80`00000000 fffffa80`00000000 : dxgmms1!VidSchiSubmitRenderCommand+0x241
fffff880`036d6cd0 fffff880`03e37e96 : 00000000`00000000 fffffa80`04046b00 00000000`00000080 fffffa80`056cf010 : dxgmms1!VidSchiSubmitQueueCommand+0x50
fffff880`036d6d00 fffff800`02f15c06 : 00000000`038d65af fffffa80`056d6a10 fffffa80`039d4040 fffffa80`056d6a10 : dxgmms1!VidSchiWorkerThread+0xd6
fffff880`036d6d40 fffff800`02c4fc26 : fffff800`02debe80 fffffa80`056d6a10 fffff800`02df9c40 00000000`00000000 : nt!PspSystemThreadStartup+0x5a
fffff880`036d6d80 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KxStartSystemThread+0x16


STACK_COMMAND:  kb

FOLLOWUP_IP: 
dxgmms1!VIDMM_GLOBAL::ReferenceAllocationForSubmission+148
fffff880`03e21098 c7442450c5f3ffff mov     dword ptr [rsp+50h],0FFFFF3C5h

SYMBOL_STACK_INDEX:  2

SYMBOL_NAME:  dxgmms1!VIDMM_GLOBAL::ReferenceAllocationForSubmission+148

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: dxgmms1

IMAGE_NAME:  dxgmms1.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  4a5bc578

FAILURE_BUCKET_ID:  X64_0x10e_1f_dxgmms1!VIDMM_GLOBAL::ReferenceAllocationForSubmission+148

BUCKET_ID:  X64_0x10e_1f_dxgmms1!VIDMM_GLOBAL::ReferenceAllocationForSubmission+148

Followup: MachineOwner

Thanks!