Dibble's selections are good for freebies
F-Secure's excellent ( but the MD's a mate so I would say that)
Excellent free Firewall software from
www.kerio.com (used to be called Tiny Personal Firewall)
I get all mine for free, but, if I didn't I'd choose
Grisoft - AVG
Kerio - Firewall
Spybot - Spyware Remover
The Beta for the MS spyware solution is very, very good
http://www.microsoft.com/downloads/d...displaylang=en