enable projector view on XP

gursaran abott

Hi

i am trying to connect a projector to my dual boot laptop which has windows
xp and windows vista
I can get a display of the projector when i connect it to the windows vista
by prsssing the Fn key + F5 which gives me an option to get display on
projector and laptop or just the laptop or the projector
but when i connect it to the windows xp it does not display thru the
projector
It sys searching vga ,composite etc.
I know the projector is fine as it works well with vista on the same computer
How do i enable projector view on XP as i can do on vista by FN+F5 key

please advice