It happens infrequently, from a few times a day to not at all. I haven't been able to determine any specific program that causes it, but it seems to happen more often while I'm playing games.
At first I thought it was temperature but although my temperature isn't the lowest in the world (42C CPU, 58C GPU) it's not sky-high. Gothic 3 would stall everytime at the same point and after I updated NWN2 it stalled when I tried to start it. Then after a long bout of elimination I uninstalled StyleXP and everything worked dandy. Now suddenly it froze again, not in a game or anything and it doesn't freeze at those specific points in Gothic3 and NWN2 anymore either though.
I've very recently reformatted, I've scanned with Kaspersky, Ad-Aware, Spybot, nothing.
I haven't changed my hardware recently, nothing new has been added. My graphics card's been artifacting as well but it's been doing that long before the stalling thing.
Is there any way to determine exactly what's causing this?
2.8Gz Pentium D (Dual Core)
7900 GT GForce (XFX) 256Mb
1Gb Dual DDR2 RAM (2x 512Mb)