[newbie] how to set up monitor res

[Chris Price]

I just installed mandrake 6.0. Install went great, but when I rebooted,
My desktop area was larger then my screen. There was no way to navigate
the windows to even shut down.
How do I change the screen settings? Do I need to change something in
the install or is there somewhere to change this?
I am a major newbie with about an hour of experience on Linux.
Thanks for the patience,
Chris