Virus attack

Virus attack, virus attack... I am so headache now. My computer on my desk in the office is attacked by virus. The laptop that I am using in office also attacked by virus. Now the worst part come in.... my home desktop is also attacked.

Not only virus, there is Trojan horse as well. I think the anti-virus software that I am using currently, namely AVG free edition is not powerful enough to clean up this stuff. I believe they all are attacked when I was transferring the data using my thumb drive from other workstation. I think I copied an infected files into my thumb drive and the virus spread everywhere..... Ahhhh!!!

I need something better other than re-formatting them. I need solutions. I need help. Please!!!!