Safely closing 2nd instance of W7 guest

[MD521]

I inadvertently used the Mac cmd+C to copy within the W7 guest, and it opened a 2nd running instance of Windows. I can't figure out how to close just that one. Trying to close it, closes them both.

I tried shutting down the guest, and restarting VirtualBox. I even deleted my latest snapshot. However now, when I start the W7 guest, I still always get 2 of them with the [Running]:1 and [Running]:2 in the title bars in scaled mode.

Please help!

(I have since installed SharpKeys and remapped the copy and paste functionality to prevent this in the future.)

Thanks!!

[noteirak]

The VM has 2 screens configured. Go into the settings, Display section, and change the amount of screens to 1