Hello Burghard,

before we look deeper into specfics, please check:

Did you look into the most common reasons the game could crash?
http://steamcommunity.com/app/230190/discussions/0/523890681426547342/

Also do you have the minimum required 4GB RAM?
Do you use a 32bit or 64bit Windows?

Otherwise we would need to take a look at your output_log file.

Cheers