Based upon the information in the mini dump file, there can be several causes to your problem. One is a virus, though unlikely, but it was the most important one to check.

Ken felt that a sfc was necessary, due to potential corrupt files.

The next most likely cause is hardware. Check your hard drive for problems.
http://www.tacktech.com/display.cfm?ttid=287

Also turn off your computer and boot. Listen carefully to the number, length and order of the post beeps. Report back.