There have been a few threads with good links to free AV and Anti malware programmes- have a trawl through this thread over on BYT:
http://www.beatyourtruck.com/forum/s...ad.php?t=29560
I personally use CCleaner and Malware Bites, they work great & I havent had any major issues in a long time- all the more impressive given the 'adult' nature of the websites I sometimes visit....