The Smart Marketers Resource Handbook
This list below gives a list of good quality antivirus software
Microsoft Windows Defender (Spyware Protection Beta)
This is microsofts new free program that is effective and really works well on
removing viruses and protecting your PC.
AVG Anti Virus Free
This anti virus software not only scans you computer but also filters your
incoming and outgoing email.
Spybot Search and Destroy
This free antivirus software normally picks up stuff and software don’t see.
A free anti virus software that's also very thorough.