Spybot-S&D©®, the best (according to PC World, PCMag.com>, ...) privacy software available! If you're new to Spybot-S&D, we recommend that you read a bit about it first (unless you want to skip that and directly download it); if you are looking for help, our support section will be the place you are looking for.
Spybot - Search & Destroy detects and removes spyware, a relatively
new kind of threat not yet covered by common anti-virus applications.
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-S&D is free, so there's no harm giving it a try to see if
something has invaded your computer.