anti-virus software?

I got feed up with Norton and removed it from my system todaybecause it hogged way too many resources among many otherannoyances.

Now I'm looking for a light weight but effective anti-virussoftware and fire wall. Any suggestions? A far a firewall goes, doI need anything more that what comes with Windows XP PRO?

Thanks for any advice!

Rick
SolidworksGeneral