Wow. Come on a forum with a resident expert, ignore all the advice then go ahead and put one of the worst resource hogs of a antivirus on your machine on the advice of a commercial magazine.
Ok....
Hey, I didnt ask for antivirus.
"PC Magazine" examined in its labs(also took researches of others) 22 today suites and deduced that NIS 2013 and N360 are the bests. Second options; Eset Smart Security 6 and Caspesrky Internet Security 2013.
I dont know why u think that NIS is "the worst resourse hogs". There are lighter suites yes, but with worse antivirus or firewall.
About Avast Internet Security 8, says "hard installation in already infected systems. Bad protection from phishing. Firewall has weak spot".
Do u really want to help? Get one of my other threads, which remain unanswered for weeks...