My son's desktop PC runs Windows XP and Linux, utilizing Ubuntu. Has run fine for quite some time and is now stuck at the Windows loading screen where the white bars just continue to go across the screen indefinately. He has tried numerous help suggestions from other searches to no avail including running it as a virtual machine (which worked only twice). He's completely wiped the hard drive and has tried installing two different Windows XP programs- still didn't work. Most recently told that the hard drive most likely had a bad sector and should be replaced. Purchased a 160G 7200rpm hard drive and installed it last night. Computer is doing the same thing! Windows will not get past the loading screen. Before I break down and take it somewhere, I decided to post here where I've found many solutions in the past. Does anyone have any thoughts? Thank you!