I use avast on all my home computers. Today A program claiming to be anti virus live infected my computer. Avast didnt catch it. I want to let them know. It is a terribly troubling virus. They want 50 to 70 dollars to eliminate it… I hope it gets added to data base soon…
lsg
Here’s a blog post from the How-To Geek about how to remove Antivirus Live :
http://www.howtogeek.com/howto/8693/how-to-remove-antivirus-live-and-other-roguefake-antivirus-malware/
But it would be even better if avast! could catch it 
Remove Antivirus Live (Uninstall Guide)
http://www.bleepingcomputer.com/virus-removal/remove-antivirus-live