Try the Windows Logo key and letter U key combination:
1) Press and hold down the Windows Logo Key (the thing that looks like a "flying window") which is located between the Ctrl and Alt keys on your keyboard.
2) Press and release the U (as in Umbrella) key.
3) Release the Windows Logo key.
You'll hear the computer saying things like "Foreground window, Microsoft Narrator, OK, push button, ..." (etc.)
(When it gets annoying, just close out of all the dialog boxes that appeared by clicking their close (X) buttons.)