SPYBOT SEARCH & DESTROY
by:  Patrick M. Kolla
website: http://www.safer-networking.org/en/home/index
support:
http://www.safer-networking.org/en/tutorial/index.html

Download 

Well, let's see, how do I explain this software.  Unlike Spywareblaster, Spybot S&D actually immunizes your system then continues to run monitoring for spyware/adware.  It is one of the best, if not the best, spyware/adware discovery/remover out there AND IT'S FREE.  Setup is pretty straight forward and up keep is nice because you can schedule scans and updates so you don't have to monitor it but check it when you up date your Spywareblaster once a week or two.  Now, it also works in conjunction with Spywareblaster to offer a complete package.

Going GEEK:

Unlike Spywareblaster, Spybot S&D protects against java based spyware/adware.  It does have to continue to run to give you real-time protection but the system drain is minimal.

Here are the  current definitions so you can update before you go back on the web:

Detection updates 2005-06-30

Advanced check library update 2004-10-14