The Windows operating system is not able to set an individual ICC monitor profile for each of your dual monitors.  This is something that is handled by the operating system and will occur in all Windows platforms including XP and Vista.  This is a known issue with the operating system and only some video card models include a separate calibration curve loader.

To calibrate and profile dual monitors on Windows based system, your video card (driver) should provide the following features:

- Support for individual Video LUTs (lookup tables) for both monitors (support of two graphic chips)
- Support for handling individual ICC profiles for both monitors

If your video card does not support the handling of two ICC profiles, Microsoft provides a utility called  Microsoft Color Control Panel Applet that allows to define individual ICC profiles for all of your connected hardware devices (monitor, printer, scanner, etc).   This utility will run on Windows XP only.  At the present time there is no work around for the Vista platform of this nature.  If you are interested in further research on this applet you may locate the download and further documentation here.

X-Rite's Technical Support and Software Development teams have done extensive research using dual displays and the use of ICC profiles in these environments.  We would like you to keep in mind that the most ideal way to run a dual display setup from one operating system is to have the ICC profiles applied from 2 separate video cards.  This truly is the best way to ensure that the profiles are both generated and being applied correctly as so many cards do not allow the option utilize separate LUTs from one card.  If you are creating and using 2 profiles on one card and are having issues with color, contrast, brightness or others, you may want to disconnect the secondary monitor and then try reprofiling the primary display to verify the accuracy.  Researching the video card through the manufacturer is also a great place to start to verify what the specifications of your particular card can handle.