Hi all, just fixing the 4th PC with this horrible social / chat program Zango installed. It's basically a vehicle for all manor of malware, it will drag your PC into the depths of cruddyness.
If you have it installed, or need to deal with it - I very highly recommend MalwareBytes Anti-Malware:
http://www.malwarebytes.org/
That will get rid of it and other nasty malware that your virus protection might not cover. It's free, and unlike most free solutions out there - it actually fixes the problem. Download, install, and keep it in reserve.
Just a little heads up from one very annoyed IT engineer.