I've never got. What pops up?

Try -
Ctrl+Alt+Delete, find anything running on the computer that doesn't look normal, like if its called orbit.exe or something. Try closing everything, like explorer, winamp, all that, and everything you can in the system tray thing. It will be easier to find the program if you do this. Go into Program Files and see if there's anything that might be Orbit. Also look for folders and shit that you haven't seen before. Make sure that you End the Task, (the Orbit program) using the Task Manager (the thing you get when you press CTRL+ALT+DELETE) Then delete the program file. Then empty your recycling bin.

Hope that works?...