I am such a rebel.. I took off all virus scanning software when I last redid my system.. these products are such memory and resource hogs! I basically perform a virus scan every few weeks and then immediately remove the software.. I know it is not foolproof.. but then again.. I'm not all that concerned if something did happen because I can easily restore.

You might look into AVG for a lighter VS software... Norton and MCAfee are just too resource intensive... but.. Good luck!