To my great surprise and dismay the Trovigo virus could pass thru the Avast defense and infect my Firefox browser. I’ve already performed quick scan as well as deep scan with a reboot, but no relief. All google searches advise me to download another anti-malware software to take the virus out. I don’t want to do that. Could anyone please tell me if there is an Avast solution to this problem? Thank you.

Could anyone please tell me if there is an Avast solution to this problem? Thank you.
Trovigo is not malware .... it is a PUP PUP = not virus / Possible Unwanted Program ..... usually crap that comes bundled with freeware downloads

avast PUP detection is default off exept for in boot scan … so if you want PUP detection, turn it on

PUP are usually easy removed with Malwarebytes and AdwCleaner http://malwaretips.com/blogs/trovigo-virus-removal/

if you need removal help, follow instructions http://forum.avast.com/index.php?topic=53253.0