A really good free AV would be Microsoft Security Essentials. Avast! recently let me down so I no longer trust it. Same with AVG and NOD32.
People cannot complain about getting viruses if they're using the free versions of any of the Anti-Virus products. Purchase the products. Free technical support & full protection. AVG Internet Security works very well these days and I find it doesn't slow my PC down like Kaspersky or McAfee! Another good product is PrevX. It's new and can won't replace your current anti-virus. It finds all bad files on your PC! check it out: www.prevx.com/
Never heard of this. There are a lot of good free antivirus/ firewalls (avast,antivir, avg).
[Edited by Vegetta, 11/29/2010 8:37:53 AM]
You need to think about AVG once again...
I know that AVG has some problems but i think it's a trustworthy antivirus. Personally I use Eset security.