About a month ago I noticed my computer started to chug for no reason then it would randomly restart. I was told to re-install Windows which I did about 2 hours ago, and I still have the same exact problem, I was told by a Best Buy technician that it was a corrupted file in Windows so thats why I re-installed. When I go AFK for a few minutes I come back to a black screen that says Reboot with Disk Multimedia or something on the lines of that. Please any help would be greatly appreciated because I cant seem to find any answers.