Try editing the graphicSettings.lsx file to set the game to run in a window, or download the replacement My Documents D:OS folder to try (see above).
Check your firewall settings; a couple people with Dragon Commander (using an earlier version of the same game engine) had a black screen on startup with just the game's mouse cursor shown due to firewalls.
Error code c0000005 is a memory access violation, but there can be a variety of different causes.
Try checking your system files:
- press WinKey-X and select Command Prompt (Admin). Alternately, click Start, type cmd into the search box, right click the program and run as administrator.
- type the following command and hit Enter
sfc /scannow
When that is done, type exit and hit Enter, then reboot your computer.
