I'm with whoever was talking about software hang ups. I would also agree that you should try a fresh install of Windows. If you've got Windows Vista or Windows 7, you can just select to do the install without deleting the partition or formatting the drive and it will move any files/folders that normally would be overwritten to a folder called "Windows.old" under your C: drive. You will lose your program installs, but I would say that if the problem is bothering you this much it would be worth the try.