The way i fixed my was several system restores, which eventually made a reformat. I'm sure there is a simple solution though, lemme dig out my threads and see if they help you. My PC seemed to crash alot:
http://shoutbox.menthix.net/showthread.php?tid=50175
http://shoutbox.menthix.net/showthread.php?tid=50124
http://shoutbox.menthix.net/showthread.php?tid=50147