Hi, this 100% disk usage problem appeared quite often when I installed windows 8.1 on my new gaming rig but thanks to this community, by disabling windows search, superfetch BITS etc, its normal. Now the only problem is that when i startup and hit the desktop, the usage remains at 100% for several minutes and then normally drops. I have checked several hard disk utilities and chkdsk itself. Everything shows zero damage and no bad sectors on the hard disk. So I'm going to install windows 7 now. What do you guys think, should I try something new? I will update after installing windows 7