Hello. I have the same problem, did you find a resolution?
I tried Intel generic drivers but they will only run one display at a time, either the LCD or the projector but not both.
Windows XP plug and play does see the projector as an additional monitor but only for a few seconds, then it removes the display. This cycle happens over and over, off...on, off...on, etc...
No, unfortunately I never found a solution. Had to buy a new projector. I never had a problem with XP though, only Windows 7.
Thanks for the reply. Not the answer I was hoping for though.