Happened to me. Updated spybot and got a virus from the update.

Basically, never update from any site besides spy-bot, dumb move on my part but just thought I would share it.

 It wouldn't update from the stock servers for some reason so I went on google and looked for it. It was from some odd download site, I think fulldls.com or something similar.

Anyway it was CalmWin that picked it up (I had it run it from an external drive because I couldn't even boot anymore)