Question. I installed AVG free 8.0 and it's scanning my CPU.
I've left it on overnight and it's still scanning. It's currently at 14 hours and has detected 21600+ threats...

How long does it take to fully scan?
Wow... just wow. At this point I'd tell you to save what you can (if you even could save data without it being contaminated by a virus at this point) and nuke your hard drive and reinstall. But being as it got this bad... I don't think there's a point. Just put your computer in the trash can and walk away from the internets, if not for your own good then for the rest of us on it (/end sarcasm).
In all seriousness though, submit your scan results to Guiness, I don't think people could intentionaly infect a computer worse than what you have... and it would still work.
Good luck though. I hope this works out for you and in the end you've learned to be safer on the internet. If it don't kill you, it'll just make you stronger.