Spybot — Search & Destroy can detect and remove in great quantities of adware and spyware from your computer. Spybot-S&D is free, so there is no harm giving it a try to see if something has invaded your computer.
Spyware silently tracks your surfing behaviour to create a marketing profile for you that is transmitted without your knowledge to the compilers and sold to advertising companies. If you see new toolbars in your Internet Explorer that you haven’t intentionally installed, if your browser crashes inexplicably, or if your home page has been "hijacked" (or changed without your knowledge), your computer is most probably infected with spyware. Even if you don’t see the symptoms, your computer may be infected, because more and more spyware is emerging.

Spybot can detect and remove adware, spyware, dialers, keyloggers, trojans, usage tracks, threatening ActiveX. When Spybot found a threat, Spybot will save removal of threats by shredding them.

With online-update feature ensures that Spybot always has the most recent and complete listings of adware, spyware, dialers, and other uninvited system residents. For advanced users, it allows you to fix Registry inconsistencies related to adware and to malicious program installations and to fix some registry inconsistencies and extended reports.

You can change the skins of this software. The new version improves the program starting time!

You can download Spybot - Search & Destroy here:
Spybot - Search & Destroy: Detects and Removes Spyware.