Build Your Own Free Internet Security Suite.
Use One Anti-Virus, One Firewall And As Many Anti-Spyware Programs As You Want !.
Here Is A List Of Some Free Anti-Viruses.
I've Listed The Name, Download Link And Detection Rate To Make
Your Life Easier.
Avira AntiVir PersonalEdition Classic:
http://free-av.com/
94.26% Detection rate
avast! Home Edition:
http://avast.com/eng/download-avast-home...
87.46% Detection Rate
AVG Free Edition:
http://free.grisoft.com/doc/downloads-pr...
82.82%% Detection Rate
For Anti-Malware Protection, Use These 3 Anti-Spyware.
Windows Defender:
http://www.microsoft.com/downloads/detai...
AVG Anti-Spyware:
http://free.grisoft.com/doc/downloads-pr...
Ad-Aware 2007:
http://www.download.com/3000-2144-100459...
Use All these 3 Since Not One Of These Can Remove Every Single Spyware. Use Windows Defender As It offers Real TIme Protection, And AVG ANd Ad-Aware As They Can Detect The Malware That Windows Defender has Missed.
Also Consider Installing A Firewall.
It helps Blocks Intruders Who Want To Access Your Computer.
Here's A Free One.
COMODO Firewall Pro:
http://www.personalfirewall.comodo.com/
It's The Best. All Top Contributors Recommend It.