Windows 7: Please help - Windows 7 x64 shutting down, is it my graphics card???

Microsoft (R) Windows Debugger Version 6.11.0001.404 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.

Loading Dump File [C:\Users\richc46\AppData\Local\Temp\Temp1_Windows_NT6_BSOD_jcgriff2[1].zip\Windows_NT6_BSOD_jcgriff2\102310-19749-01.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 (8 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7600.20738.amd64fre.win7_ldr.100618-1621
Machine Name:
Kernel base = 0xfffff800`02c1f000 PsLoadedModuleList = 0xfffff800`02e53eb0
Debug session time: Sat Oct 23 18:17:24.575 2010 (GMT-4)
System Uptime: 0 days 0:00:32.605
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 116, {fffffa8007ef8010, fffff88004006f94, 0, 2}
*** WARNING: Unable to verify timestamp for atikmpag.sys
*** ERROR: Module load completed but symbols could not be loaded for atikmpag.sys
Probably caused by : atikmpag.sys ( atikmpag+6f94 )
Followup: MachineOwner
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0: kd> !analyze -v
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*                        Bugcheck Analysis                                    *
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VIDEO_TDR_FAILURE (116)
Attempt to reset the display driver and recover from timeout failed.
Arguments:
Arg1: fffffa8007ef8010, Optional pointer to internal TDR recovery context (TDR_RECOVERY_CONTEXT).
Arg2: fffff88004006f94, The pointer into responsible device driver module (e.g. owner tag).
Arg3: 0000000000000000, Optional error code (NTSTATUS) of the last failed operation.
Arg4: 0000000000000002, Optional internal context dependent data.
Debugging Details:
------------------

FAULTING_IP: 
atikmpag+6f94
fffff880`04006f94 4883ec28        sub     rsp,28h
DEFAULT_BUCKET_ID:  GRAPHICS_DRIVER_TDR_FAULT
CUSTOMER_CRASH_COUNT:  1
BUGCHECK_STR:  0x116
PROCESS_NAME:  System
CURRENT_IRQL:  0
STACK_TEXT:  
fffff880`05fa39c8 fffff880`042aeef8 : 00000000`00000116 fffffa80`07ef8010 fffff880`04006f94 00000000`00000000 : nt!KeBugCheckEx
fffff880`05fa39d0 fffff880`042aec02 : fffff880`04006f94 fffffa80`07ef8010 fffffa80`093e7d50 fffffa80`08694410 : dxgkrnl!TdrBugcheckOnTimeout+0xec
fffff880`05fa3a10 fffff880`04355f07 : fffffa80`07ef8010 00000000`00000000 fffffa80`093e7d50 fffffa80`08694410 : dxgkrnl!TdrIsRecoveryRequired+0x1a2
fffff880`05fa3a40 fffff880`0437fb75 : 00000000`ffffffff 00000000`0000054c 00000000`00000000 00000000`00000002 : dxgmms1!VidSchiReportHwHang+0x40b
fffff880`05fa3b20 fffff880`0437e2bb : 00000000`00000102 00000000`00000000 00000000`0000054c 00000000`00000000 : dxgmms1!VidSchiCheckHwProgress+0x71
fffff880`05fa3b50 fffff880`043512c6 : ffffffff`ff676980 fffffa80`08694410 00000000`00000000 00000000`00000000 : dxgmms1!VidSchiWaitForSchedulerEvents+0x1fb
fffff880`05fa3bf0 fffff880`0437de7a : 00000000`00000000 00000000`0000000f 00000000`00000080 fffffa80`08f89c68 : dxgmms1!VidSchiScheduleCommandToRun+0x1da
fffff880`05fa3d00 fffff800`02f29336 : 00000000`02f8697e fffffa80`0932cb60 fffffa80`06ca9890 fffffa80`0932cb60 : dxgmms1!VidSchiWorkerThread+0xba
fffff880`05fa3d40 fffff800`02c62106 : fffff880`009e6180 fffffa80`0932cb60 fffff880`009f10c0 3078302c`3078302c : nt!PspSystemThreadStartup+0x5a
fffff880`05fa3d80 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiStartSystemThread+0x16

STACK_COMMAND:  .bugcheck ; kb
FOLLOWUP_IP: 
atikmpag+6f94
fffff880`04006f94 4883ec28        sub     rsp,28h
SYMBOL_NAME:  atikmpag+6f94
FOLLOWUP_NAME:  MachineOwner
MODULE_NAME: atikmpag
IMAGE_NAME:  atikmpag.sys
DEBUG_FLR_IMAGE_TIMESTAMP:  4ca29309
FAILURE_BUCKET_ID:  X64_0x116_IMAGE_atikmpag.sys
BUCKET_ID:  X64_0x116_IMAGE_atikmpag.sys
Followup: MachineOwner
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