[How-To] Windows 8 Setup
All of the following steps took me hours to figure out under Windows 8. The good news is the game runs extremely well using the following steps and it fixes all issues I know about.
1. Right click the darksouls.exe and click "compatibility" tab. Run in windows 7 compatibility mode.
2. After installing initial game, uninstall GFWL client AND the redistributable from the "Programs and Features" area of Windows 8.
3. Download newest verstion of GFWL from Microsoft. Install it by right-clicking the executable and using "run as adminstrator".
4. Use DSFIX mod in DATA folder under Steam/Dark Souls directory to make the game look and play better. In case you do not like to read directions, make sure to uncheck anti-aliasing option within Dark Souls game upon installing this mod.
Upon doing these steps you should have a completely working version of Dark Souls.
Sinon pour l'OP essaye ça