Computer locks up after a certain amount of time during some games. Specs: Windows 98 SE DirectX 8 Biostar M7VKD KT133A SND AMD Duron 900 TTGI 320W Power Supply (AMD approved) 256MB name brand ram (Crucial I think) 10GB Western Digital ATA-33 HD Diamond Monster Sound MX300 PNY Geforce2 MX400 Real Hollywood+ DVD-ROM Plenty of fans The main culprit is Black & White. After an hour the computer has a tendency to completely lock-up. I don't think the problem is heat. I have a decent cpu heatsink/fan, chipset fan, videocard fan, and two case fans. Does anyone have any ideas on what it could be?