umm if ya wanno go hassle free with top security try, Bit Defender 10. amazing firwal.
Nod 32 is one of the best av among the pros.
Leave Nortong well alone is a nasty resource hogger to say the least.
A reasonable all rounder is zonealarm security suite.
I would still install windows cleaner and a seperate additional anti spyware pro, they dont all pick up all of the bugs.
Best regards from the Geek