That usually means
A) To high of an overlock
B) Graphics card
is getting to hot (but since you are at the desktop this seems to be a non-issue
C) You may need to reseat the graphics card
D) The graphics card is dieing and needs to be replaced
A: Running at stock settings...hadn't even tried to overclock when this started happening. Also, it NEVER happens when running in game...only with desktop or other non-3d. However, when it did happen I ran some tests and it forced a restart when trying to go into the 3d test. 725MHz GPU clock, 1000MHz High Performance.
B) Temp not a problem
C) I reseated once, but the case was a little dusty...I may airblast it out this weekend and re-seat.
D) I've only had the card about a month...so at the worst I'll just have to RMA it. It is a pain though.