Ad-Aware is a privacy tool, that scans your memory, registry, hard, removable and optical drives for known data-mining, aggressive advertising, and tracking components. The program detects a wide range of adware/spyware related issues and can be updated with the latest signatures via the built-in update utility. http://www.lavasoftusa.com/software/adaware/

Spybot - Search & Destroy can detect and remove spyware of different kinds from your computer. http://www.safer-networking.org

These instructions give detailed steps to scan and remove spyware and adware from your computer using Ad-aware and Spybot - Search & Destroy