Here are the most recent version for the most usefull Anti-Spyware programs:
These are FREE: Do not trust programs providers who are asking money for the "benefit" of their protection: they are ripping you off and most likely copying the work from the guys who create these programs below:
SpywareBlaster: V3.5.1
The homepage is: http://www.javacoolsoftware.com/sbupdate.html
Ad-Aware SE: V1.06
New build: is now available: V1.06
The homepage is: http://www.lavasoftusa.com/
Spybot: v1.4
The homepage is: http://www.spybot.info/en/index.html
1) NOTE:
SpywareBlaster is for the prevention. It stops "some" spyware from installing by changing some settings in IE
Spybot and Ad-Aware are cleaners: which means they remove spyware from your machine after it has been infected. But you need to use BOTH.
2) REMEMBER: check for updates at least once a week.
Each of these software requires a "reference" file which is updated very very regularly, (once a week or more). To ensure efficient protection and clean up, you need to make sure you are using the latest reference file.
3) USE THEM: at least once a week.
For more info check out my page. (see link at the bottom of my posts).
Last: Spyware are a pain, but with little efforts and discipline, you can eliminate the problem from your machines.