if you want to pay i would go for Kaspersky. best there is, combined with spyware nuker.

If you dont want to pay i would use Avast and ad-aware. as a AV and as a anti spyware.

they both work great

for a firewall i would recomend kaspersky again.
but if you have a spare computer i would recommend smoothwall or IPcop firewall, nothing comes true it. but as said, you need a computer for it + 2x network cards (as it runs it own firewall OS as you could config true a web interface)