請教LAPTOP快捷鍵問題，重裝後如何恢複 Fn+F6,7,

SONY VAIO VGN-B100BD NOTEBOOK , I　just reinstalled win xp sp2. but cant have the Fn+F2,F3,F4,F5,F6,F7,F10 functions work, but Fn+numlk, Fn+insert and page down up worked, I installed the SONY control drivers from sony website, still no go, anyone knows which file will work for this? so I can use those hotkey and S1,S2 keys? how active those Fn + F7,,F6 F5 F4.......functions?

thanks