Thanks for the suggestion! I also used Kaspersky before and it is really lightweight.I'll second Webroot! I used Kaspersky before which is very good but also has a very heavy footprint on your computer and installed a lot of extra stuff I didn't want.
I've been using it for almost a year now I think? And I've never had problems with an infection getting past it. It's extremely light on resources. I don't even notice when it's scanning. Compared to most AVs slowing your system down when scanning. I can't rave about it enough. Especially if you don't have a beefed up PC or entry-level laptop like I do it's great!
avg is just okay … it's got a nice "shred-file" feature which is included with their free version." Avg antivirus is best from others... "