Spybot - Search & Destroy can detect and remove spyware of
different kinds from your computer. Spyware is a relatively new
kind of threat that common anti-virus applications do not yet
cover. If you see new toolbars in your Internet Explorer that you
didn't intentionally install, if your browser crashes, or if you
browser start page has changed without your knowing, you most
probably have spyware. But even if you don't see anything, you may
be infected, because more and more spyware is emerging that is
silently tracking your surfing behaviour to create a marketing
profile of you that will be sold to advertisement companies.
Spybot-S&D is free, so there's no harm in trying to see if
something snooped into your computer, too 
Download it from here