flip screen on two 1703FP's

Hi there

I attached two Dell 1703FP to my GeForce 5200 graphics card in my new Dell OptiPlex.
The problem is now that I would like to rotate both of the display's by 90 degrees and expand the screen to both of them.
If the screens aren't rotated I am able to choose to expand the screen to both of the display's (so that the start button is on the left lcd and the bar with the clock is on the right one). If I've expanded the display, the option to rotate isn't available anymore. I'm using WinXP with SP1 and the newest driver from Nvidia.

Is there any possibility to do what I like to do?!

Thanks for any answers and sorry for my bad english.. (Normally I'm not speaking english ;) )

Ghosty