For some reason this isn't working anymore.
At the time I'm pretty sure all I did was use the CTRL-ALT-ARROW hotkey which would automatically rotate it. I know I can do this as I have done it before (albeit a year ago). I am trying to rotate my screen 90 degrees so I can read some articles in portrait. It is quite dinky and is the same size as A4 paper.
I have a Dell laptop (Latitude D420 1 GHz) running XP Pro SP3.