Seems like Ad-Aware is a fairly popular antivirus software so figured I post this. Looks like they were bought out by a mal-ware company and now when you update to the newest version, it can potentially hijack your browser. Here's the link that I found it from:
http://forums.steampowered.com/forums/showthread.php?t=2738880
http://forums.steampowered.com/forums/showthread.php?t=2738880