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. (Official description)

Running on Wine: the current version has a few issues running on Wine, which include:

• Using the integrated update function is not possible because the default animation may cause problems, and also the checkboxes in front of the update list are not available (still to be tested on newer Wine versions than Ubuntu default).
• For scanning files in the Linux partition, a drive mapped to it has to be added to Settings -> Download Directories.