Where's My VST Instruments Window Gone?

I have Cubase Artist 6.0.7
I use PC W7
One monitor correctly configured

When I click on “Devices” I can open and see every window EXCEPT “VST Instruments.” When I click on that, my main cubase window becomes smaller and nothing else opens. I moved the main window around an even minimized it; nothing is behind it.

How do I resolve this?

Why are you posting in multiple forums?