my system specs is as follows- Mother board- Asus P5ND, 4 GB RAM ( Transcend 2GB x 2 ), Samsung 1TB HDD, Intel Core 2Quad Q6600, Nvidia GTX 465 and 600w SMPS. My problem started a few days ago when i was downloading something by u torrent, at that time i was using windows7 ultimate edition, then suddenly my system restarted and hanged on the welcome screen. I tried several times but it kept hanging on the welcome screen even after reformatting. so i finally formatted in xp but now even after installing all the drivers my system shows found new hardware for my audio device though i have already installed all the drivers. even on device manager it shows audio device on high end audio bus in yellow colour. and most of the time my system keeps hanging, i cant even move the mouse cursor so i have to hard reboot again. mostly while installing any software or launching nvidia control panel my system hangs. so i need some professional help coz i dont think the local hardware guyz can even help me. so if u r not a professional then pls dont even bother to answer. its a very serious problem and i need help immediately.