StopZilla Anti-Spyware: http://www.stopzilla.com/download/download_select.aspx  - CNET Award Winner for Most Advanced Pop-up Protection Available.

Microsoft Anti-Spyware Software (Beta): http://www.microsoft.com/athome/security/spyware/software/default.mspx

SpyBot Search and Destroy Anti-Spyware: http://www.safer-networking.org/microsoft.en.html

LavaSoft Ad-ware: http://www.lavasoft.de/ms/index.htm

Stinger: http://vil.nai.com/vil/stinger/

McAfee: http://vil.nai.com/vil/content/alert.htm/

Symantec: http://securityresponse.symantec.com/

Trend Micro: http://www.antivirus.com/vinfo/

Security Administrator: http://www.secadministrator.com/

Microsoft Security (General): http://www.microsoft.com/security/

Microsoft TechNet Security Bulletin: http://www.microsoft.com/technet/security/current.aspx