This ost is in the wrong place.
I recommend just a free antivirus. AVG and Avast are popular around here. For a firewall the SP2 and Zonealarm will do fine. As for spyware just use spybot, adware personal, and microsoft antispyware. They work fine. It wouldn't hurt to use spyware sweeper either.
Warning: using 2 or more AVs can mess with your system big time.
that thread has the links you can use to d/l these programs. save you some time.
Oh and DJ-Chris will recommend a hardware fire wall, i would as well if you have the money.