Have you tried updating Windows and/or your graphics driver?
Windows 7 Service Pack 1 has been out for some time.
Only the SP1 Release Candidate is out, not the final version. (I installed the RC version on my secondary PC just for fun, but I didn't notice any differences for good or ill.) The RC should be pretty stable, though, so it might be worth a shot. I just wanted to warn you that it's not final software yet.
I have freshly installed my operateing systme, done the hardware and software updates thinking was the old operating system but the problem keep doing the same thing. It could be that the motherboard has a defect and needs to get replace. On the motherboard theres some brown marks but they are not even on any chips, capacitors or transitors. Here is my current setup
Motherboard: EVGA 650i Ultra
CPU: Intel Pentium D 965 Extreme Edition 3.73 GHz
RAM: 2x OCZ SLI Edition 1GB DDR2 PC2-6400 and 2x Patriot Viper 2 2GBs both running at 5-5-5-12-2T
Video Card: EVGA GT460 768MB DDR GDDR5
PSU: OCZ Fatal1ty 750W
Case: Cooler Master Scout
Hard Drivers: WD20 EARS 2TB and WD75 750GB
Just thought of this. I was having some sleep issues a while back. The hardware wasn't completely re-initializing (most likely a mobo problem) and so I'd end up being forced to do a hard shutdown. I fixed the problem by switching (in the BIOS) to S1 sleep mode instead of S3. Try that.