I was under the impression that DX10 was supposed to be backwards
compatable.

Googling.

1st hit on "Vista and DX9"

As found he http://www.ngohq.com/news/9608-vista-requires-
directx-9-neowin.html

Turns out that Vista's DirectX 10 is not fully backwards compatible
with DirectX 9, and Vista does not ship with the components required
for all games that utilize DirectX 9. Therefore, if you get any
errors about missing DLL files from games when you try to run them in
Vista, then you'll have to actually download and install DirectX 9.
Did you check to see if there were any settings in the game that
referred to PhysX?

Bill
--
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A couple of excellent points, I was not aware that I could install DX9c on
top of DX10, I will give it a go.
The game settings do not refer to Physx specific settings, I will ask the
game support site which ones are Physx related.

thanks for your perseverance.

regards

Daniel