Windows 7 32bit Seeing Nvidia 8400M GT As Standard VGA, Sony Vaio

My System:

Sony Vaio VGN-FZ38M
Windows 7 Home Premium 32bit
Nvidia Geforece 8400M GT
Drivers tried - 306.97

[Code].....

Red entries are my edits. As you can see in nvmt.ini I've copied the Section numbers from the previous entries, as in: %NVIDIA_DEV.0426.9005.104D% = Section006, PCIVEN_10DE&DEV_0426&SUBSYS_9005104D

I've had some limited success...

My system now sees the GPU as an Nvidia 8400M. So far so good. However I'm still getting error messages. Firstly, on reboot, the system stops the card because of driver problems. Secondly, if I run the Nvidia software, it says the monitor is not connected to an Nvidia card. Lastly, if I update the driver, it reverts to Standard VGA in the Device Driver list.

So, It looks as if I need to do more. My immediate thoughts are:

1) Should I be editing the nvmt.inf file, or perhaps another one - nvmm.ini or nvlt.in? How do I know which nv??.inf to edit?

2) In the nv??.inf file, I have no idea which 'section' to point at. I tried 11 and 12 as seen in another thread, but got the same issues. So I tried the same section entries as the next most similar card, but to no avail.