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