Firewall: Zonealarm or comodo AntiVirus: AVG, but I recommend buying one, I'm not current on the best so check a recent Cnet review. Spyware: AVG free
Check this link, http://www.microsoft.com/protect/viruses/xp/av.mspx My vote is for Norton Internet Security. I think that you will get three months free Norton Internet Security by this link
The best absolutely free software is the following. I hope this is helpful and if so let me know AntiVirus : Avast Free Home Edition Available Here. http://www.avast.com/eng/avast_4_home.html Spyware And Firewall. Abolutely Awesome And 100% Free and available here. Comodo Firewall Pro. Once You Run It Look To The Top Right For The Download Link To The Spyware Monitor. http://personalfirewall.comodo.com/
I agree AVG but it can be annoying when it does a scan on everu startup and i cant find a way to disable it.
Zonealram is the best free firewall out there and AVG is a great free antivirus. Other great free tools out there are adaware and spybot s&d to take care of your spyware problems.
avast! is my favourite anti-virus. It updates automatically, so you can just set it up and forget about it.
I Use the AVG Internet Security suite that you can buy from there website. ive used it for about 4 months now, and it doesnt slow my computer down as much as programs like nortons etc do.
ive used AVG free anti spyware and AVG free virus checker, i like them, computer seems pretty safe with them