If you want free protection you can find a list of products at:
http://www.deletespyware-adware.com/InternetSecurity.htm
In short the best but free products are:
Avast - antivirus
Spybot search and destroy - anti spyware and adware
Zone Alarm - firewall protection.
If you have WinXP turn ON Firewall and Automatic updates. You do that from Start, Control panel and click Firewall icon and Security setting icon.
Karl Sultana
March 2007