i have a lwend machine (533mhz 128ram)and have tried every av out there...after trying all i found avast to be the friendliest on my machine...takes very little resources and works very well for me.
if you are already using norton I wud stick with that. There aren't any problems with it and I mean, if you payed money for it you might as well stick with it.
mcafee v8.0 ... i think it has the biggest virus definition plus many trojans and worms...! and does not use your cpu at all while running in the background..!!
