How Recover a Off Screen window.

How to move

Right-click on the window caption on the taskbar, or select it and use Alt+Space.If the Restore option is available, select it to pop the window out of minimized or maximized state.
Choose the Move option.
Hit an arrow key.
Move the mouse.

I just had this issue :-D found out how to do it this works.I do not know way this happens but it does.It happened when i disconnected every thing to clean out the dust in my desktop.My Star Trek Online game launcher was off screen.I hate it when that happens.