So, my PC has been acting up recently. It began when I attempted to install Windows 8.1 through a disk I had laying around. The install failed, and it threw up the message "We'll restore your PC to the way it was before the install was attempted." However, after that, my PC wouldn't go all the way to sleep (fans/front panel LEDs still active) and it bluescreened on login. It said that it needed to be repaired, and so I threw in the repair disk for 7 (what I was/am on) and repaired it. It logged in, but it still refused to sleep. I tried to login this morning, and it bluescreened again. Not too surprising, I thought, but when I went to repair it again, something was different: The only OS it showed as being on my C drive was Windows 8.1, presumably from a time a while ago where I had it installed and then swapped to 7. So my question is this: could this be indicative of some conflicting Windows files that are causing a BSOD, and what should I do to stop these things from happening? Just re-install windows? Specs in profile.