My monitor went portrait. Help!

[Big TR]

I came home today and booted up. The monitor has gone portrait. I'm too stupid to figure out how to get it back to landscape.

I'm running a new Dell box with the latest Windows.

Help a guy out please.

[Big TR]

Well, Dell came through for me. I guess if you hit Ctrl, Alt and an Arrow key, it changes the orientation.

I now know a good way to f with everybody's computer.