My configuration is MSI RS480, AMD Athlon 64 3000+, 512Mb DDR 400, XFX Nvidia 6600GT, 80gb Sata, Sony Combo Drive with PSU 500watt. my pc freezes after 10mins of gameplay. if i open the graphic card and use the onboard graphics it works perfectly. i have checked the temp of the graphic cards and its way below threshold figure. i just cannot figure out wats the problem. Upto u guys now to help me out.