I use all of these.
Foxie
http://www.getfoxie.com/
My SpyCatcher tips.
What it does, after the search, it offers choices of what to do with
files found, which can be a bit daunting.
All these choices, like > Ask, can ( after research or your own
knowledge of what you have installed ) be changed, if they are false
positives. In the Status window, the Protection ( in the middle of the
page ) section, click on the files found.
It also finds uninstall exe's, which I change to > Allow.
SpyCatcher Express
http://www.tenebril.com/consumer/spyware/spycatcher-express.php
* Allows novice PC users to remove aggressive spyware
* Stops next-generation, mutating spyware
* Blocks reinstallation of aggressive spyware
* Removes spyware safely and automatically
* Database receives 6 million spyware submissions per day
ewido security suite free for Windows 2000/XP
http://www.ewido.net/en/features/
http://www.ewido.net/en/download/
SpyBot
http://www.softpedia.com/get/Internet/Popup-Ad-Spyware-Blockers/SpyBotSearch-Destroy.shtml
http://www.safer-networking.org/en/index.html
http://beam.to/spybotsd
Update from MajorGeeks if unable to get from Spybot > Spybot Search and
Destroy Detection Update
http://majorgeeks.com/
Bad Checksum message
http://www.safer-networking.org/en/faq/20.html
SpywareBlaster
http://www.wilderssecurity.net/spywareblaster.html
Ad-Aware
http://www.lavasoft.de/
http://www.lavasoftusa.com/
Bazooka
http://www.webgrid.co.uk/security_2.html
http://www.webgrid.co.uk/index.html
http://www.winsite.com/bin/Info?17000000037943
http://www.kephyr.com/
NetDetox
http://www.netdetox.com/
95/98/NT/ME/2000/XP/2003
a-squared Free
http://www.emsisoft.com/en/software/free/
http://www.majorgeeks.com/download4281.html