SUPERAntiSpyware
A very effective tool to remove covert tracking and adware software.
The following programs I fully endorse and use myself.
And the best part is that they're all FREE!
(Click images to download)
Avast! Antivirus
This is the best antivirus I've ever used.
I have used it exclusively since 2004.
Malwarebytes Antimalware
Without a doubt, this is one of the best tools you can have in your arsenal.
Ccleaner
An excellent, fully selectable Temp File and Registry cleaner.