I recently upgraded my PC with ASUS P5QC motherboard, 2Gb DDR2 RAM from Kingston, GForce 9800GT graphic card and new powersupply. I installed XP SP2, Symantec AV 10. and MS Office 2007 and connect to Internet via ISP. PC is working fine apart from freezing after 2 -3 min using. USB mouse and keyboard are freezed. I have to press on/off button to restart again. I realy don't know what cause it, the other thing I'm thinking off motherboard is faulty, but I can't return it, because I bought via Internet.