i have got that virus "FBI" 2 times... it sux. I had a real bad version a while back and recently got one when I clicked on a link that said JEWGROUNDS.
It sounds like your .fla's are corrupted. It sounds like your flash program is. Just a thought.
Slirun
u should use avast and the best part is that they are free here's the link <a href="http://www.avast.com/en-us/index">http://www.avast.com/en-us/index</a> btw u could also speed around 20-50 bucks so your Avast could be more protective and stronger for your computer ;)