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why not try reformatting and reinstalling the OS? or using a different OS?
ECS K7S5A is cheap, fast, and stable 
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well, i'm lazy. My computer was ultra stable until i started playing games again. When my PC was first built i used it mainly for surfing the web, but then i discovered Stronghold, RTCW, and Motor City Online, and the stability just sucks. I have to reboot once a day.
I have the latest VIA drivers, latest Nvidia, latest SB Live, latest critical updates. Motor City Online tech support said they believe it is a memory timing issue with VIA and my geforce