i want to install 555M, but it say error :

NVIDIA Installer cannont continue
This graphics driver could not find compatible graphics hardware.
[edit]
ok, i had fixed it, but it doesn't show up

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My problem has been solved using the this method.

I too had the same issues and i am using the AutoCad 2012, Win 7 64bit.

Install the nvidia GT 540M beta driver 275.27

Open Nvidia control panel and select as follows....

3D Settings - Manage 3D settngs - Global settings - Preferred graphics processor - Set to High performance Nvidia processor

3D Settings - Set physX confirguration - Select Geforce GT 540M

All of the above isnt new but the next step is what solved it for me.

Control Panel - Personalisation - Select a Windows 7 Basic Theme.

This turns the windows AERO interface off.

Windows uses the Aero for all windows through the intel card.

So in cad the conflict comes beacause although you have selected the nvidia card, as soon as a windows command is executed it uses the aero interface and therefore reverts back to the intel card.

Zoom operation cad crashes.

Not sure if the explantion is completely factural but its worked for me and that was the way i understood it.

Give it a whirl.