CoolWWWSearch.SmartKiller (v1 and v2) is a new, real ugly variant of CoolWWWSearch. When running, it will close every browser window you use to visit a large list of anti-spyware-sites, and even will close Spybot-S&D and some other anti-spyware applications as well.

So if your copy of Spybot-S&D (or the anti-spyware application of your choice) closes a few seconds after starting, or your browser closes whenever you try to visit an anti-spyware site, try this CWS.SmartKiller removal utility.