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.
so again i look to mr. search engine and i stumble upon one forum that this thing happened because you installing incompatible OS on the laptop, like the laptop was sold in japan but you use windows xp with english version, for that we need to install additional library from sony, for my case it is in here:
you only need to download Sony Shared Library.
after installing and restarted the fn f7 key for monitor switching finally worked.

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