Ad-Aware 2007 Free is out. They say that it is "the world's most popular anti-spyware". Not sure about that but it did clean some stuff not detected by other software programmes I have on my pc. It also works with Windows Vista 32Bit
During the installation process, I was a bit confused when a popup asked me for the registration code. I choose cancel and found that it had been installed.
The free version does not offer real-time defence against spyware and you have to run it manually.
One feature that particularly attract me is it's ability to repair damage left by malware. Had bad experiences in the past when removing spyware caused the system to function erratically.
Download 'Ad-Aware 2007 Free' here.