If you use a dual monitor or switch resolutions a lot, you have probably come across this problem. You’re using your Windows application and it pops up a dialog box. Only problem is, the dialog box is off of the screen. D’oh! That has happened to me on multiple occasions until one time when I had enough and googled it. Turns out there is a nice easy solution.
Just press Alt-Space, and then press M. This will load the "windows menu" (the menu that pops up when you click on the top-left-most icon of a window) and select the Move command. Then just use the arrow keys to move the window to your current screen. Presto!