I installed a simple little script program that allows you to snap windows to the edges of screens or to other monitors. By default, I think - I've had this program running for a long while on windows, it takes over the same shortcut key. I installed it on my win8 machine and it seems to have done the trick and taken over the same shortcut used by narrator. I realize win8 has good support for snapping windows around, but I like this shortcut to do it because that's what I'm used to and it has the nice side effect of preventing narrator from starting. You can also do more advanced window placement, but I find I just throw things back and forth to other monitors.
In any case, it's worth a try. I just set windowpad to run on startup so it's always active.
lifehacker link to windowpad article