Symantec Endpoint Protection. I have it installed on all 3 computers. It's a great program with many features. I get it free from work, that's a pretty good price
I did use AVG for the longest time. My daughters computer got a nasty virus from one of those "Glitter Graphics" sites for Myspace. It infected it so bad I had to reload Windows for her. AVG did nothing to that virus...did not even detect it in a scan.
After fixing my daughters computer, I did a scan on mine with AVG...detected nothing. I installed Symantec and ran a scan...19 Trojans found and quarantined.
I'll never trust AVG again.