Just a heads up if you have AVG on a machine that you need bitcoin to be running on, it might not be running right now.
I became irritated with the spam bundled with AVG and switched to Microsoft Security Essentials. It seems to be of equal (or better) quality to AVG, but without the annoying popups.
Anyway, if your anti-virus software Doesn't report bitcoin.exe as infected you should get new software. Several people have wrapped a trojan around the bitcoin.exe and spread it into the wild to perform CPU mining, and there are lots of pretty signatures in the bitcoin executable for the scanners to find. You should be able to whitelist bitcoin.exe and move on.