Sonar went insane on me. It suddenly decided that a bunch of programs I've had for quite some time were "malicious", and it deleted all of them. The programs deleted included Daz Studio 4, Notepad ++, CDisplayEX, HP Simplesave, WinRar, Mario Paint Composer, it even deleted the Norton Instillation files shortcut on my desktop!!! What the heck?!
UPDATE: Okay, it looks like what it actually did for the most part was delete the desktop shortcuts, though I did still have to reinstall Daz Studio. So, not as big a disaster as it looked, but still very disconcertingm and I'd still like some sort of explanation.