The chemical reactions module on 8.3.18 has a problem under Windows Vista and Windows 7 due to the tighter security model of Windows Vista and Windows 7. The program works under Windows XP and there is a workaround to get it to work under Windows Vista and Windows 7. Since version 8.3.18 is an old version, we don't plan to fix that problem in release 8.3.18. The chemical reactions module will work under the next JMadonna release.

Install Berkeley Madonna 8.3.18 as Administrator to avoid the error message about failure to register a subkey.

1. In Windows Explorer (not Internet Explorer) find where you installed the file "madonna.exe". The standard place is "C:\Program Files\Macey & Oster\Berkeley Madonna\madonna.exe".
2. Right-click on madonna.exe and select "Properties".
3. In the Properties dialog box, choose the "Compatibility" tab.
4. Click the checkbox for "Run this program in compatibility mode for:"
5. Select "Windows XP (Service Pack 2)
6. Click the checkbox under "Privilege Level" for "Run this program as an administrator".
7. Click the "OK" button to dismiss the dialog.
8. Double click "madonna.exe" to run the program.