a-squared Free is a good addition, though it throws up a few false positives, which you can always check via virustotal or jottis malware scan (Pl.Google them), before taking any action.
AVG 8.5, alas is running out of steam and it's dedicated core are moving away.
Malwarebytes in realtime should be good.
Ad-Aware is not very popular these days after they have started selling it and moreover you don't know what you are quarantining or deleting.
The Tea-timer in Spybot is a beauty.
You can download and use Emco's Malware Destroyer.
http://www.emco.is/products/malware-...r/download.php