When your subscription runs out, dont bother renewing it, norton is popular, and well advertised but ineffective. I wouldnt recommend mcafee either.
What i would do is get a free firewall : zonealarm click here - it takes searching for but the free version does exist on there. Then id download avg antivirus (free edition) click here then id get some anyi spyware apps : click here - spybot search and destroy and ad aware - click here
I know it might seem annoying after having had NIS payed for, but use it only for whats already payed for, after that it isnt worth it.