Most likely a graphics driver error, but I can confirm this if you upload the minidumps here >>
1 > create a new folder on the desktop and call it "dumpcheck" or whatever you like
2 > navigate to
c:\windows\minidump and copy the last few minidump files to that folder. *this assumes 'c' is your boot drive, if it is not, subsitute accordingly
3 >
close the folder and right click on it and select
Send to Compressed (zipped) Folder.
4 > use the "manage attachments" in the "advanced" reply window to upload that zip file here as an attachment.
This might point us to a non Microsoft driver causing the error, if one exists for it.
If you do not see any minidumps, be sure you are not using any cache cleaner such as CCleaner. Also run
sysdm.cpl and select Advanced > Startup and Recovery. Make sure "small memory dump" is the one chosen under "write debugging information" and the location should be
%systemroot%\minidump
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Do make sure you are not overclocking anything, and that you have the latest graphics drivers from ATI.
PS: this is an NVIDIA statement on the issue -- as it has plagued them as well as ATI, and might be worth a read >>
http://forums.nvidia.com/index.php?showtopic=65161