[reldridge]

I'm surprised nobody else has suggested it, but I'm a big fan of Microsoft Security Essentials. Free, low memory utilization, and so far has kept us safe on both of my PCs, my parents' PC, and my inlaws' PCs. It's updated vary often (multiple times a week), and like I said, its nice and low-memory-hogging.

http://www.microsoft.com/security_essentials/

I also am a fan of Avast for free stuff to, more so that AVG. I found it took less memory, and the updates were quicker.

On the corporate side, we're actually going away from Symantec Endpoint Security (Norton corporate), and are heading to Vipre. http://www.vipreantivirus.com/ Apparently it's been good on our 'sister' network, and we'll be moving to it next week.

-Ryan