Game does not Start (Steam)

[tryptamin]

I now have checked the "my documents" "Amnesia" and there is just one folder: "Main" and nothing inside...

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now i tried in compability to xp sp2 an got the following: could not load main init file: config/main_init.cfg

I also load the demo to check, if steam ist broken but the demo is not running, too.... Has no one an idea?

My System:

Packard Bell Laptop

Windows 7 Home Premium
ATI DH 5650
4GB Ram