Sage end users happen upon a fatal error during the installation of Sage getting an error message saying that you don't have the correct Windows user permissions to access the areas affected by the installation. To fix failed Sage software installation visit http://sagehelp.support/sage-customer-tech-support for detailed explanation on fatal error and troubleshooting steps to fix this installation problem.
Note: This error can also occur if your disk is faulty. To resolve this error, download the software instead.
As a matter of fact, it is annoying to get an error message where you suddenly pause during your installation. To overcome this glitch, ensure you're logged into Windows as a user with full administrator privileges. With Sage 50 Accounts v21 and above - This message may appear when installing the standalone Sage Data Service. If so, check that .NET Framework 4.5 is installed. If not, install it.
If this doesn't resolve error 1603 issue, refer to www.sagehelp.support or dial a toll-free number for a crystal clear assistance.
External Link: 888-846-6939-Fix Sage Error: 1402 - Could Not Open Key; Get Sage Support | http://bit.ly/1VO8Goq | https://goo.gl/1kQmB7