Windows Installer error 1603
While trying to install the drivers for the new Microsoft Sculpt Ergonomic Keyboard, the installer presented the following informative message:
Microsoft's knowledge base article, "You receive an error 1603: A fatal error occurred during installation error message when you try to install a Windows Installer package", suggested:
The SYSTEM account does not have Full Control permissions on the folder that you are trying to install the Windows Installer package to.
As all permission were in order, I remembered the old adage: When in doubt, shutdown your antivirus software. So I did, tried to reinstall and error 1603 disappeared.