Hey Terry,
Thankyou for your reply.
I've uninstalled en re-installed the newest drivers for video and sound.
Altough NVidia claims they have WHQL-drivers, my Windows XP still reports that my GeForce 6200 hasn't passed the WHQL-tests.
Further I've uninstalled and re-installed Ship Simulator, however, the problem stays the same.
I'm out of ideas, unfortunately..