You may receive this error message if any one of the following conditions is true: Windows Installer is attempting to install an app that is already installed on your PC. The folder that you are trying to install the Windows Installer package to is encrypted.
The error message is: 1603 Fatal Error during installation. Consult windows installer help (msi.chm) or MSDN for more information. This is a new wireless USB adapter so it should work on Win7.
An MSI file is a Windows Installer package that contains some of the information needed to install a service or product, as well as instructions and data for directly installing (or removing) a routine in many installation situations. However, when running an MSI with any Windows Installer service installed, you sometimes notice a fatal error with exit rule 1603.
Error 1603: A dangerous error occurred during installation. If you click OK on the message box, the corresponding setting will be cancelled. You can respond to this error message if one of the following conditions is true: Windows Installer is trying to connect an application that is already installed on your computer.
Click Start, click Run, type /UNREGISTER’ ‘msiexec without quotes, and then click OK. Even if someone succeeds, it may seem that nothing is happening, or you are sure to see an hourglass for a moment. Run, display, click Run, type “MSIEXEC /REGSERVER” without quotes, then click OK. After executing this command, the execution is complete.
Why is MSI error 1603 fatal error during installation?
MSI device formats are used to install or possibly remove software. When Windows stops installing software properly, the user stops with error 1603. The error message “1603 Severe error during installation” is displayed. What causes fatal error 1603 during installation?
What was the error MSI installation error 1603?
Error 1603: Fatal error during installation. If you click OK on the message box, the installation will be cancelled.
How to resolve MSI installation error 1603-windows server?
To solve this problem, use one of the following methods, depending on the cause of the problem: 4 Check if the application is out of date. 2 Install the folding bag. 3 Install the surprise on the disk. 4 Granting full access permissions

Ermias is a tech writer with a passion for helping people solve Windows problems. He loves to write and share his knowledge with others in the hope that they can benefit from it. He’s been writing about technology and software since he was in college, and has been an avid Microsoft fan ever since he first used Windows 95.