Love how some people recommend Antiviruses that aren't even listed in the options ... way to bring the thread off-topic.
Anyway, avast! and Avira are two excellent free Antiviruses, and often recommended by malware removal helpers on various notable forums. AVG is loosing due to it's bloat, kind of poor detection rate (along with high false positive ratio) and the fact that it bundles a stupid spyware in it's installer. An Antivirus company bundling a spyware with an Antivirus product, we've seen everything now.