Invisible Windows, can't restore the window.

There is a great post on missing windows in Vista, windows not showing up at:
http://sursumcorda.salemsattic.com/archives/2006/08/15/invisible_firefox

My problem was that Mozilla Firefox chose to open and seemed to only display on the taskbar.  When I maximized the window or put it in full screen it showed up.  But when I tried to put it in windowed mode or restore it to my working size it disappeared.  It seemed to be going down below my taskbar.

When I came across the above post I was able to find that the I could try the Move Window function to get it back on my screen.  I right-clicked on the tab in the taskbar and then selected Move.  I then used the arrow keys to get it back on to my display.