URL Blocked Malicious keeps popping up

Viruses and worms
1

Infection Details
URL: http://17.feedadvertising12.com/2feed?ty…
Process: C:\Program Files\Mozilla Firefox\firefox…
Infection: URL:Mal

2

follow the guide and attach the logs

http://forum.avast.com/index.php?topic=53253.0

AdwCleaner
Malwarebytes
OTL
aswMBR

3

Duplicate topic here, http://forum.avast.com/index.php?topic=105780.0.