In such cases, the app is likely still installed on the PC, resulting in this error when you attempt to reinstall the app. If you previously had a desktop shortcut for an app, the shortcut may have been lost during the upgrade to Windows 10. To resolve this problem, use any one of the following methods, depending on the cause of the problem:Ĭheck if the app is already installed on the PC.

You notice the error message because the Windows Installer service uses the SYSTEM account to install software.

The SYSTEM account does not have Full Control permissions on the folder that you are trying to install the Windows Installer package to.

The drive that contains the folder that you are trying to install the Windows Installer package to is accessed as a substitute drive.

The folder that you are trying to install the Windows Installer package to is encrypted.

Windows Installer is attempting to install an app that is already installed on your PC.

You may receive this error message if any one of the following conditions is true: If you click OK in the message box, the installation rolls back. When you try to install a Windows Installer package, you may receive the following error message:Įrror 1603: A fatal error occurred during installation. This article helps fix the error 1603 that occurs when you install a Microsoft Windows Installer package.Īpplies to: Windows 10 - all editions Original KB number: 834484 Symptoms

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