Satellite A100 (PSAA9): Win7 + screen brightness adjustment issue

Hi
I have installed Windows 7 64-bit on my toshiba A100 (psaa9) machine, and i cannot modify screen brightness anymore.
It is maximum brightness always. Fn key does not work, and neigther i can modify the brightness manually through nvidia control panel. nvidia driver is 7.15.11.7967, installed automatically with windows.
In a similar thread http://forums.computers.toshiba-europe.com/forums/thread.jspa?messageID=182780
i've read suggestions about Value Added Package to be installed, but there is no package like this for my model.
how can i fix my problem?
thanks

hi all,
thank you for reply!!!
ok, i tried to install VAP and Flash Card Utility for Satellite L500. first, installing Flash Card Utility i got invalid serial number error. i've read in forum that it might be due to inappropriate driver for my version on laptop or if i did not install VAP first. so, second, i tried to installed VAP, but i get value "Setup tvap error 0x8146045B" :(
according my display driver: it was nVidia driver automatically installed with win7. in fact there is no display driver for win7 64bit version on toshiba website... i guess i have more problems with display, as my secondary display blinks every time some system event like driver/program installation or usb device plugging-in or -out happens.

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