Splinter Cell: PT

Someone please help,

I am running and ATi Radeon x800 Pro with Ati Catalyst 4.6 reference drivers.

In the original splinter cell game on my Nvidia Geforce FX 5900 I had some impressive character shadows aswell as some dynamic shadows which I think are called 'projector' shadows.

However, I have installed SC:PT on my new setup and the game is missing all dynamic shadow effects. On the original game there was a setting in the default.ini file where you could manually select which shadow method to use, i.e. Stencil Buffer or Projector, however there is no such setting in the ini file for SC:PT

Anyone, able to help me get this working properly please?