teacherthomas

Avast. Free. Small. Auto update and often update. Checks well, though Manual scan isslower then others does not hog resourses.
www.avast.com

vic46

Antvir - easy to use, free auto notice of update availability, scheduler and does not seem to effect operations when it is running in the background. I have used it for several years.
Vic

JanS

Are most of the recommended programs listed above just for AV, or do they cover other things like the Norton internet security I'm using now?

I've always been happy to pay for the NIS, but the 2007 version is too busy and has lots of little annoyances, so I'm ready to ditch it.

Crocodylus

Used to use AVG but changed to nod32 when my pc was infected and avg didn't detect it. I also want to try Kasperski soon, since i've heard its a good program also. Also it does not hurt to have more then one AV program in your PC, just make sure you have only one resident at all times

kunerd

AVG on 3 pc's for over couple years now

yoink

I run AVG on several computers as well. I love it.

gnatster

Add another to the AVG camp. Been using it for years.

greenfish

NOD32 Here - Works great. Updates regularly. Doesn't hog resources.

Bert H

Just to update, I ended up with AVG and have been quite happy with it.

Script404

No it doesnt, although it does have a commercial version that does, I've tried it and its I'm guessing a lot less of a system drain than Norton just from experience of other Norton products.