Dear threesheets,
Welcome dear friend!If you are teenager like me who steps over the line now and then ,you'll get a rap on the knuckle! The Admin knows i am more innocent and less dumb! That's all! No questions are dumb, as they are the ones which create fierce debate in this site!
McAfee Security has a validity for only one year!So,no A-V, no firewall, no anti-spam!Finis.
Pros and cons exist in every A-V, but the ratio changes. Nothing's pluperfect, but the nearer you can reach there the better! AVG, Avira Antivir, Avast (all free) ? Since you mentioned AVG,let's contain our debate to it. AVG Free is very good and has real-time protection. Updates have been reported to be a problem. It (think) has anti-spyware function ,but it's no rock of Gibraltar!
Yes, you have to completely uninstall McAfee, before installing AVG.(It goes for any A-V)
AVG Free has no firewall. Check it out here:
http://free.avg.com/
Your first PC in eight years!Treasure this one Buddy and keep it safe from all the malicious folks out there! Best Wishes!!