(Note that the minimum system requirements are provided for low detail settings and no animated water in mind).
If you have problems such as graphical corruption or crashes, try updating your graphics card's drivers. Click on the following manufacture of your card to download the latest drivers.
If you have tried many different settings, and you have the latest drivers already, in some rare cases reverting to an older driver version can solve the problem.
If you still have problems, go here and post the issue you are experiencing.