You can move offscreen dialogs by hitting Alt+Space, then M, then an
arrow key, and then moving the mouse. The letter M is for MOVE on
English systems. If you have a different language, try this with another
window first so that you can see the shortcuts in the window's system
menu.
You can also open the Windows registry editor (REGEDIT) and go to
Current User -> Software -> Somusque and delete all the DActOpt entries
there.