Free Downloads
The most requested recommended free downloads are free virus scanners, free firewalls and free spyware removers. There are a lot more, but these are among the best.
Free Virus Scanners
AVG Highly recommended by users.
Avast Also highly recommended by users.
Antivir
Microsoft Security Essentials I am using this on two computers!
A Free Firewall
Comodo Here is what the site has to say "It's Free. Forever. No Catch. No Kidding." Highly recommended!
Free Spyware Removers
Just go to Spyware Removal Tools and get them all! Be sure to update each before running!