Reality Check: The biggest difference between Free Antispyware and Paid Antispyware is "Real-Time Blocking". There's not a single FREE antispyware on the market that provides "Real-Time Blocking", and none of them removes all traces of spyware in your computer once infected; repairs of this nature average $150.

In order to prevent spyware, malware, and adware from installing in your computer you need "Real-Time Blocking", that is, you need to buy the software. We recommend SuperAntispyware Professional. Try it for only $30.00 or get a Lifetime Subscription for an extra $10 only. They even include a 30-day 100% Unconditional Money Back Guarantee.

Another one that is pretty good is Malwarebytes' Anti-malware

Real-Time Blocking: Prevents potentially harmful software (spyware, adware, worms, dialers, hijackers, keyloggers) from installing or re-installing.

Registry Protection: Prevents Browser Hi-Jackers and other threats from attacking your registry.