T42p vista fn + f3 and fn + f4 functions (turn off screen and sleep) not working correctly

Hi -- I recently installed windows vista on my T42p.  It works fine except that the fn+f3 and fn+f4 functions do not work as expected.  Before installing the hotkeys driver, the fn+f4 function worked correctly while f3 did not (going to sleep worked, turning the monitor off did not).  I then installed the recommended hotkeys driver.  Now fn+f4 makes the monitor turn off while f3 does nothing ... fn+f4 is supposed to put the laptop to sleep.  On top of this, if i select "sleep" from the start menu, the computer turns the monitor off instead of going to sleep.
Presumably, the sleep button could still be telling the computer to go to sleep, but the actual operation of going to sleep is now broken?  Just a guess.  Anyways -- anyone know how to resolve this so that fn+f3 turns my monitor off and fn+f4 puts my computer to sleep?

I've too this problem, but more, my sound mute wasn't worked (for deblock, but it can block it few second before...) 5 days in 5-6 instalation of three version of winxp: winxp ru x64 sp2, winxp es/ru sp3 x32.
eventually I've found and ran "TPOSDSVC.exe" in instalation directory and it give an opportunity  deblocking the sound volume!!!!!!!!!!!! and I don't need more functions 
volume levels and brightness adjustment worked well without OSD (before I ran TPOSDSVC.exe) and with OSD.
and now I don't know worked this bustered sound driver in winxp x64.
ThinkPad T61 7664

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