FWIW, I was scared to death of moving to 8.1 but I did and have had no problems whatsoever. I know it's bad advice to tell someone that because surely the next guy who does it, well, his computer bursts into flames. But, honestly, I have had nothing but great behavior for about 4 months now. I should say that the computer already had 8. I just upgraded to 8.1 from there.