Windows 7: the big game crash

ok, so here's the deal:

new Windows 7 64bit ultimate install on an SSD
EVGA nForce 590 SLI MB with a dual core 3ghz am2 cpu
2 gb of corsair dominator RAM (pc2-6400)
2 gb of kingston hyper x RAM (pc2-6400)
MSI geforce 560 ti twin frozr II
1TB samsung spinpoint f3

That's my setup, now here's the problem. Every time I try and start a game on steam the game starts fine but about 5 seconds into a game my computer just shuts off. It isn't over heating. I double checked that a PCIe x16 2.0 card is backwards compatible with an x16 slot. Everything looks and runs perfect until I go into a game. I have the newest graphics and MB driver and i'm about to flash my SSD and BIOS to the newest versions. Does anyone have any idea where the problem could lie? If it's not a driver issue I have no idea what it could be.

I'd suggest that you first backup your stuff and then make sure you've got access to another computer so you can contact us if problems arise. Then make a System Restore point (so you can restore the system using the Vista/Windows 7 Startup Repair feature).

In Windows 7 you can make a Startup Repair disk by going to Start....All Programs...Maintenance...Create a System Repair Disc - with Windows Vista you'll have to use your installation disk or the "Repair your computer" option at the top of the Safe Mode menu .

Then, here's the procedure:
- Go to Start and type in "verifier" (without the quotes) and press Enter
- Select "Create custom settings (for code developers)" and click "Next"
- Select "Select individual settings from a full list" and click "Next"
- Select everything EXCEPT FOR "Low Resource Simulation" and click "Next"
- Select "Select driver names from a list" and click "Next"
Then select all drivers NOT provided by Microsoft and click "Next"
- Select "Finish" on the next page.

Reboot the system and wait for it to crash to the Blue Screen. Continue to use your system normally, and if you know what causes the crash, do that repeatedly. The objective here is to get the system to crash because Driver Verifier is stressing the drivers out. If it doesn't crash for you, then let it run for at least 36 hours of continuous operation (an estimate on my part).

If you can't get into Windows because it crashes too soon, try it in Safe Mode.
If you can't get into Safe Mode, try using System Restore from your installation DVD to set the system back to the previous restore point that you created.