[Halindir]

Halindir's new computer, its magnificent in every way. Except for the XFX GeForce GT520 2gb graphics card I bought - because I have no knowledge in computer hardware.
And the dreaded game freezes.

No matter what setting I set my games to, they freeze, with not option to tab out, or ctrl+alt+del. I have to reboot, every time it happens.

They do seem to run smoothly at mid/high settings though, until they freeze

When the freeze occurs the game music stops, and the ambient sounds continue. Until i press alt+tab or ctrl+alt+del - which doesn't do anything.
If I wait long enough, the computer will reboot, after freezing.

My specs (of which i know of)
ASUS MZN-E SLI
AMD Athlon 64 x2 Dual Core 6000+
4GB RAM
XFX GeForce GT520 2GB

The freezes happen wether the computer is completely cool, or slightly warm (like the forehead when you've got the olde common cold)
All fans are spinning
And no dust

I tried taking all the RAM-sticks out, and using only one at a time. The pc booted normaly, on all of them

Im pretty desperate here. And I don't really want to fiddle with the hardware except if its really necessary - testing the RAM felt like handling plutonium :C

Any advice would be greatly appreciated.