Can' t launch Penumbra with Ati hd2900xt and winxp?

[reg]

Hi,
Thanks for your answer,
I've already updated with the 1.0.1 patch for penumbra overture ep1, found at http://support.frictionalgames.com/entry/66/.
Unfortunately, the hlp.log file is a 0ko empty file, certainly cause the game didn't want to launch...