Been very pleased with Zone Alarm...has good ratings, very easy to use, much smaller and more efficient than any Norton product.
EDITAlso, got it for free...Amazon had a rebate that killed off what was left after the competitive upgrade offer from Zone Alarm.
On a side note, was installing utilities for the new motherboard and got to the one Asus called "antivirus utility." Figured it was a mobo tweak, so loaded it....and got suspicious when it took FOREVER to install.
Yep, the "antivirus utility" from Asus was Norton Internet Security combo, with firewall, antivirus, parental controls.
Took a long time to uninstall, too.