Sounds like you need some multiple monitor managing software. Try these:
MultiMon (Free) click here
UltraMon (Paid) click here
Other than that, you can try flying blind and navigating using the keyboard or maybe bump your resolution to the highest possible setting and perhaps that will bring the dialog either partially or totally into view.
I have Intel Graphics Media installed. Isn't that a multiple monitor manager?
You can try to right-click on the RH button in your task bar and go to Move, but that doesn't always work. I found a nifty little tool a while back called Force Window Visible. Get it here. When you run it, it gives you a list of programs. Click an item that is offscreen, and it is pushed to where you can see it.
Hope this helps,
If monitor management software isn't handy/available, you could also try Control Panel, Display, Settings, to see if you can change it back to a single monitor when you are working with just your laptop display. Don't forget to change it again when you are using more than one display again in the office.
I am also noticing other weird things like "Manage Workspaces" dialog is too narrow to actually use (82px x 272px) and not resizable. My Help -> "System Info" dialog is also super narrow and tall (62px x unknown(maxes out at 1200 px high screen resolution)).