K thanks for the response, i've filmed the crashing:
http://www.youtube.com/watch?v=rR84YYu6RT0
First; it works very well. I load up a track (w/o water). It does a pretty long time for loading the scenery, is this normal? Then, a sudden bluescreen pops up. I can't do anything but pushing the power button. The strange thing is: the button reacts immediately (push-shutdown).
When restarting everything goes slow, it lasted for 3,45 minutes till the login screen popped up!
I hope someone can help me with this [:)]