Before you start using the simulator, spend some time browsing the FORUM and more specifically the "Frequently Asked Question" session.
You might find there precious tips on how to use eDiving and explanations on issues that have been reported already.

Also, note that the most common problem reported is "video card not supported" ....
Make sure that you have a supported video card AND that you have the latest and greatest driver from the manufacturer.
Check THIS POST for a list of supported video cards.

Before you start a dive, MAKE SURE your diver is equipped properly. Please read the DEFAULT GEAR post.

Regards,

AM