CUDA 2.3 driver with GeForce 9800M GT

I have just tried to upgrade my Dell XPS laptop to the latest 2.3 CUDA Driver.

The installation comes to an end very quickly saying that there is nothing compatible with
my current setup.

My laptop has TWO GeForce 9800M GT GPUs on board.

I have simply downloaded from the CUDA Zone and clicked run on the dialog box.
Did not unistall the previous driver.

The currently installed driver is reported by Windows Control Panel->System as

       Date 30 April 2009


and my CUDA version is 2.2 - this has worked since installation in 2009.

Is the 9800M GT no longer supported or have i made some error in the uprade process ?