Ok..... check for a virus... If that doesnt work, then when the window pops up. Press CTRL-ATL-DEL at the same time (once).
A window will come up. Look in the window for a program running that your not sure of.. Click on it and close it. See if when you close a program if the little pop-up goes away.. Then see if you can find that program in the un-install program in the control panel.
EP, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS