Then start with your video drivers and make sure that AVG Anti-virus is up to date.Windows 7 Kernel Version 7600 MP (4 procs) Free x64
Then if that doesn't work:dxgmms1!VIDMM_GLOBAL::ReferenceAllocationForPreparation+0x22
dxgmms1!VIDMM_GLOBAL:repareDmaBuffer+0x43f
dxgmms1!VidSchiSubmitRenderCommand+0x241
dxgmms1!VidSchiSubmitQueueCommand+0x50
dxgmms1!VidSchiWorkerThread+0xd6
nt!PspSystemThreadStartup+0x5a
nt!KxStartSystemThread+0x16