Ok so 2 days ago I updated my laptop to Windows 8.1 and it took about 2 hours to update, ok, fine. I turned it on after said update and at first things were fine, until the laptop froze. So I reatarted the laptop and now, for the past like 36 hours, the desktop will disappear for a second, then come back and it takes another second or two for the things on my desktop to come back, and when i finally get something to work, the laptop freezes again. I don't know what's causing it or how to stop it.