When I try to run Aquatica 3D, I get a message saying "could not find compatible 3D device"
This error could mean one of the following:
There is no 3D graphics card installed on your computer
You do not have the latest version of Microsoft DirectX installed
You do not have the latest drivers installed for your 3D graphics card
The latest version of DirectX can be download free from the Microsoft web site at
http://www.microsoft.com/windows/directx/default.aspx?url=/windows/directx/downloads/default.htm
For the latest graphics card drivers, go to the web site of the manufacturer of your graphics card where you should be able to download the appropriate graphic card driver.
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Why is Aquatica 3D showing error messages all of a sudden?
If Aquatica 3D is causing errors all of a sudden, it is likely that either one or more of the fish, scenery or sounds is corrupted. If you can identify the last fish, scenery or sound files that you installed then delete it from the relevant folder inside the Aquatica 3D folder which should be located in C:\Program files. If you do not remember the last item or items that you installed, then you will need to uninstall everything and start again.
To uninstall Aquatica 3D
Delete a folder called Aquatica 3D which should be located in C:\Program files
Delete the original installation files aq3d.exe or aq3d-mbr.exe from your computer
Download Aquatica 3D again from the Aquatica web site download page
Reinstall it and unlock it with the same registration name and unlock codes that you were originally supplied with.
check this page maybe the answer is here ,try to delete it and reinstall
http://www.clubaquatica.com/AQD2/support/help/troubleshooting.htm