sony vaio fn key problem

it happened when my director laptop need to be downgraded to xp. he got sony vaio vgn-sz433n.
so i install the xp pro after downloading all the necessary drives and tools for xp.
everything went smoothly, all driver installed so no more “other devices” showed in device manager.
but when my boss used it he said that the fn key was not working for the projector but it is fine for other functions.
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