Penumbra Overture Won't Run on ATI Mobility HD2600 512 Mb

[Nephil]

Yes, I found an earlier thread on this problem, and actually I have the latest drivers I can find. Anyway, I have to use modified drivers such as DNA and Omega since my laptop is not designed for XP and Asus didn't make available ANY drivers for XP for this very computer.

By now I tried both DNA and Omega drivers and Penumbra doesn't work with neither. It crashes under DNA ones, and displays the vertex unsupported message under Omega. It is quite peculiar, though, because I installed and played literally a dozen of games, and none crashed, even those that didn't recognise my video card, such as Oblivion, which runs perfectly with all the video perks. What is it so special about Penumbra that it doesn't run here? Is there a solution?