I have discovered (the hard way) that popups like that can only be turned off safely by disconnecting from the net, using the toolbar at the bottom of the screen - right-click - close window, and running CCleaner to clear your temporary internet files... THEN run antivirus to make sure. If you have system restore running, turn it off before running your antivirus. Unsolicited programs like that should be outlawed... here is the wiki I got for it, Spy_Sweeper