Dual Monitor Setup For Nvidia Cards

I've just installed Vista Business x64, however I do have some problems setting up the Dual monitors. I have: On the left a Dell 2005FPW, which is pivoted (to read PDFs and stuff like that easier) On the right a Samsung 226BW, which set to normal. However, when I go to the NVIDIA setup, and try to tell which monitor is where and which should be the primary display. The primary display always tends to be placed on the left side in the software. I want the Dell to be the extended display, while the Samsung is the primary display. But the software (either in Vista or the NVIDIA driver itself) insist on that both the primary and the first mentioned display is the same.