Virus Removal

Trend Micro HouseCall	A free online scanner that looks for both infections and vulnerabilities.
AVG Free Anti-Virus	Award-winning virus and spyware protection, now with LinkScanner.

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Spyware Removal

TrendSecure HijackThis	A spyware scanner that works by detecting changes your computer.
Malwarebytes Anti-Malware	A powerful malware remover, provides a variety of tools to handle infections.
Spybot Search & Destroy	Another award-winning spyware and adware remover. Beware of clones!

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Parental Control

K9 Web Protection

A free content-filtering solution for the home computer. Easy-to-use and highly customizable.