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Update to the latest drivers for your graphic card and see if the problem goes.
For more information on your bug check go through this thread:
STOP 0x116: VIDEO_TDR_ERROR troubleshooting Code:
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* Bugcheck Analysis *
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Use !analyze -v to get detailed debugging information.
BugCheck 116, {fffffa8004e3e4e0, fffff88004e97910, 0, 2}
Unable to load image \SystemRoot\system32\DRIVERS\atikmpag.sys, Win32 error 0n2
*** 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+7910 )
Followup: MachineOwner
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4: kd> lmvm atikmpag
start end module name
fffff880`04e90000 fffff880`04ee5000 atikmpag T (no symbols)
Loaded symbol image file: atikmpag.sys
Image path: \SystemRoot\system32\DRIVERS\atikmpag.sys
Image name: atikmpag.sys
Timestamp: Thu Mar 01 15:05:30 2012 (4F4F3BDA)
CheckSum: 00058C1A
ImageSize: 00055000
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4