Well after fiddling for a while, I came up with the following.
Assuming you are running the current 1.75 or better of DBPro and the Physx 1.05 plugin
Download from Nvidia the 8.04.25 System Software from http://developer.nvidia.com/object/physx_archives.html
Install as per normal
Open explorer and navigate to C:\Program Files\AGEIA
Technologies\demos
Copy the file DarkPhysics.dll
Navigate to C:\Program Files\The Game Creators\Dark Basic Professional\Compiler\plugins-licensed and paste the copied file (overwrite when prompted)
This fix is specific to a Gigabyte T1000P (not that is really a fix).
cheers
rich
It's late, I'm tired, out of coffee and now I'm wet.