This is what I have in my toolbox. Not a lot but it works for me.
Windows Defender http://www.microsoft.com/athome/security/spyware/software/default.mspx
Sysinternals Freeware - Process Explorer
http://www.sysinternals.com/Utilities/ProcessExplorer.html
Spybot - Search & Destroy
http://www.safer-networking.org/en/spybotsd/index.html
SmartSniff
http://www.nirsoft.net/utils/smsniff.html
Ad-Aware SE Personal
http://www.lavasoftusa.com/products/ad-aware_se_personal.php
