I have Spybot, it works, and it's free.
http://free-spybot.com/index.asp?PID=76d...CFTUHIgodQjdD9w
I also have AVG in my boot up routine, which is also a free program.
http://www.grisoft.com/doc/avgplusfw/lng/us/tpl/tpl01
Best free anti-virus program, in fact, better than Norton or MacAfee for the price.
Then add the Google toolbar, which is a great popup blocker, and you will be all set.
My computer security is now set for one notch below paranoid delusional. I've gone for over a year without the fear of intrusions, mostly.
Good luck.
