Anti-Malware

Spybot Search & Destroy -Free Anti-spyware program
Adaware Personal SE -Free Anti-spyware program
Hitman Pro - runs many of the antispyware programs all at once with scripts.
Spy Sweeper - Very good anti-spyware program. Costs about $30.
Pest Patrol - Anti-Spyware Program
Trend Micro RootkitBuster
Rogue Remover - Removes rogue antispyware, antivirus and hard drive cleaning utilities.
Panda Anti-Rootkit - Checks and removes rootkits.
SpamIntelligence - SpamAssasin and ClamAV for Outlook (free)
AVG Anti-Virus - Free
AVG Anti-Spyware - Free
AVG Anti-Rootkit - Free
HijackReader - Reads Hijack This Log Files
Different Rootkit removers on Tech Republic
Sandboxie - Sandbox your Firefox, IE, and other programs
GMER - Rootkit Scanner
Malwarebytes' Anti-Malware - Ant-malware scanner
WOT - Warns you about risky websites. Add-on for your browser.
Comodo - Good Free Firewall/Antivirus
Five step process for removing viruses and spyware from client machines
Avira AntiVir Rescue System - Rescue CD with virus scan
Trinity Rescue CD - Live Linux CD with free anti virus programs
Tech Republic list of Rescue CDs
Dephne - Kill windows processes and trap them from starting up. free
Sardu - Make bootable security CDs. Free
Microsoft Standalone System Sweeper - Bootable rootkit remover
Combofix - Good standalone malware fixer
Computer Crime Info - Good site for tools for computer security
Tron - Batch script built by reddit users to run a bunch of security programs to clean up a machine.
NoMoreRansom.org - International Anti Ransomware site