But I like it!
Windows AntiSpyware (Beta) is a security technology that helps protect Windows users from spyware and other potentially unwanted software. Known spyware on your PC can be detected and removed. This helps reduce negative effects caused by spyware including slow PC performance, annoying pop-up ads, unwanted changes to Internet settings, and unauthorized use of your private information. Continuous protection improves Internet browsing safety by guarding over 50 ways spyware can enter your PC
[ Download details: Windows AntiSpyware (Beta) ]
It did seem to require a verification of my Windows license, so if you don't have quite a legal copy, you might not be able to get this. I have little information on the database that Microsoft (previously Giant's) has put together, and how it stacks up against Ad-Aware, but so far I am impressed. It lets me set some options on how I want it to run, if I want automatic, and when, and then finds spyware for me. It registered my VNC as possible spyware, but since I installed it (and only use the client) I told it to ignore that in the future.
And for power users there are some “Advanced Tools”, including some “System Explorers” which allow you to view Downloaded ActiveX, Running Processes, Startup Programs, etc. And the software informs you what it might be, and if it might be safe. If you agree to assist their little network, you can submit programs to them to review for “spywaredness”, I sent in the one ActiveX component they don't seem to be aware of (that I have installed) Bitstream's TrueDoc plug in.
Certainly good value for the money. (Though I think I'll still give Ad-Aware a run every now and then).