Cannot update nvidia drivers after installing bootcamp drivers

Hi everyone,

I'm sorry to start again a topic that in my view has been treated many times, in many forums but HAS NOT been solved so far...I looked over many forums over the week end and tried a number of "tricks"

I'm running Windows 7 Pro Sp1 32bits on a MacbookPro 17 - intel core duo with two graphic cards but for better performance running the Nvidia GeForce 9600m GT

I have installed Windows 7 this week and then Bootcamp 4.0 - thus i have now Bootcamp drivers, ie 261.41

I have installed Battlefield 3 which asked me to update drivers to at least 285.27

I downloaded them from Nvidia site 285.27 AND 285.38 (m version - notebook) but when i start the indatllation i get the message "hardware not comptatible"

So far i have tried 1) to install non-beta older versions but higher than 261.41 (which is by the way only available on bootcamp) - it does not work 2) uninstall nvidia drivers, restarting windows with VGA driver and install newest nvidia drivers - it does not work;

What i have not tried (as it was not clear on other forum): 1) replace an INF file? - i did not understand what i have to do here 2) update other drivers? mobility? ATA? - i'm not sure what people were talking about here?

SORRY MY MESSAGE IS LONG BUT I REALLY NEED YOUR HELP - and want to play battlefield 3 that i pre bought by the way... ;-)