At the most charitable, Zwinky only may be classed as a
Potentialy Unwanted Program. It comes from
IAC Search & Media, a firm known for deceptive practice itself and for close association with even shadier affilliates, partners, and redistributors.
See
This discussion and its accompanying
Detailed Analysis.
This is a log of what installing Zwinky 's unavoidably bundled, but undisclosed, tag-along stuff does. Following a standard Add/Remove Programs uninstall of Zwinky, even knowing what else to look for and uninstall, dozens of problematic, highly suspect entries remained scattered among numerous folders, some in "Hidden/Protected" folders (difficult for the average user to find, unalterable by conventional means), "System" folders (not only Hidden/Protected, but critical to the Operating System), and throughout the Registry, calling for some fairly sophisticated, relatively heavy-duty, pretty irritatingly nit-picky cleanup (without getting all technogeek on you,
Rootkit and
Alternate Data Stream detection, termination and removal were necessary to rid the infected machine of all traces). All in all, the installation took quite bit less than 5 minutes, the uninstall and cleanup shot helloutta the better part of 2 hours.
timber's take: Zwinky is prolly not something you really oughtta wanna get yourself into.