I see you have the problem resolved but for future reference, if you see a
Restore command then that means the window is maximized, not minimized. As
Suzanne noted, the most likely cause is the document is displaying on
another monitor that's either not turned on or Windows thinks you have dual
monitors but you don't.
In any event, if you click Restore you should then be able to use the Move
command to bring it back into view.
In this situation, while deleting the Data key in the Registry resolved the
issue this time, it's likely it will come back. You may want to take a
closer look at your Display settings and make sure a second one isn't being
recognized if you aren't working with dual monitors.
~Beth Melton
Microsoft Office MVP