What’s the best spyware blocking freeware?

What’s the best free spyware blocker? I have malewarebytes, but I’d also like a program that actively checks and blocks spyware specifically.
Thanks for the help guys, I wound up downloading Spywareblaster.

Hi I am New Here, But I have to agree anti spyware in http://toptenantispyware.com site, I download the first and second, both have worked for me. I have bought them which gives me Adwatch. It runs in the background and will not allow any changes to the Startup portion of the registry.

On top of that I run registry cleaner software in http://toptenantispyware.com/registrycleanercomparison.htm

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