You shouldn't be running your computer with Norton or McAffee installed. The junk the ISP's dole out is sub standard freebie versions anyway. Remove it all, and use a good registry cleaner to get rid of any remnants, then if you absolutely must have an anti-virus on your system, get Eset Nod32 or Avast...and when you play AH, turn all anti-virus/anti-spyware off.