Spyware Doctor 4.0 for freeOk, this is going to come with a disclaimer: I attempted to install this program and it was unusable on my computer. I was able to get far enough to verify that the serial is legitimate, and that you can download updated spyware definitions, etc. The email you receive with the serial states that you will get no program updates, but it looked like I was getting some.
That being said, this is a major player in the anti-spyware business and has won awards including PC Magazine Editor's Choice
http://www.pcmag.com...,1895,1992016,00.asp, a Best of 2006 from Computer Shopper
http://computershopp...n_tech_2006_software. Other awards are listed here:
http://www.pctools.c...yware-doctor/awards/. You can read more about the program on PCTools website:
http://www.pctools.com/spyware-doctor/.
If you are interested, this appears to be a legitimate free registered copy offered through
http://www.computeractive.co.uk. The page claims that the offer should have expired in January of this year, but it is still working as of the time of this post:
http://www.computera...spywaredoctor4/indexOnce you have downloaded the program you have to click on the link that says Get Serial Code. Be warned that to get the serial, you are asked for your email address, name, address, and phone number. The page is on the actual pctools website with a prominent link to their privacy policy if that helps with any concerns.
As I said, I was unable to run the program on my computer, but then again I have a 7 year old PC. 
