Spy Sweeper was the paid version that I used to use. It was great but I have decided to give the free programs a fair chance and have solely went to free programs for everything. I use Avast Antivirus and still have yet to get infected for nearly 3 years running now. Can't hardly justify paying for something when the free stuff works so well. I also use CCleaner, works very well.
Forgot to say wat I use. I generally use Spybot S&D (great at scanning for spyware but useless at everything else) but am thinking of giving AVG Anti-Spyware a go as I use there Free Anti-Virus.
Well I use Spybot S&D, Lavasoft Ad-Aware, Windows Defender and also AVG. Yet AVG has now come to the stage where you have to buy it so don't really use it!
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I also use CCleaner, works very well. 