So I got a new refurbished gaming computer about 2 weeks ago and everything was fine whilst it was on Windows XP. Fps on my games were great and the computer in whole was speedy. Upgraded to Windows7 (The disc is legit, purchased from PC World and used twice before). And everything went to hell. I struggle to run any games at a stable fps, I range from about 10-20 fps on minecraft and runescape. Everything on my computer just seems so slow, it can have its moments but rarely. I have reduced all my system settings, and i'm using my computer in classic view mode. Can anyone help me please!?