Need Some Computer Help...

[Young Gun]

I have my laptop hooked up to a second monitor on my desk. When I unplug the monitor connected to my laptop, the screen resets and is sideways. Normally I will mess with my friends and change the way their screen faces using alt+ctrl and the direction. For some reason in this case, that does not do anything. When I plug the monitor back in the screen is upright and fine. But even then using alt + ctrl and the direction does not change anything. I have used the properties window and chosen not to extend my desktop to the new monitor and then restarted my computer without the monitor attached but it still starts sideways. It does not show up sideways in safe mode, only in normal. I run Vista by the way and have completed all recent updates.

Anybody know what I can do?