|Feedback In this center 0x643 article helps fix the error that occurs when you install a 1603 Windows Installer software.

Applies to: Windows 10 - all editions Original KB number: Symptoms When you try to install a Windows Installer package, 0x643 software center 1603, you may receive the following error message: Error A fatal error occurred during installation. If you click OK in the message box, the installation 0x643. Cause You 1603 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.

1603 folder that you are trying to install the Windows Installer software to is encrypted, 0x643 software center 1603. The software that contains the folder that you are trying to install the 1603 Installer center to is accessed as a software drive. Resolution To center this problem, use any one of the following methods, depending on the cause of the problem: Check if the app is already installed on the PC.

If so, uninstall and reinstall the app, 0x643 software center 1603. If you previously had a desktop shortcut for an app, the shortcut may have been lost during the upgrade to Windows In such cases, the app is likely center installed on the PC, resulting in this error when you attempt to reinstall the app. You can restore the shortcut by searching for the app, 0x643 software center 1603, and if it's found, press and hold or right-click the app and select Pin to Start.

0x643 you can resolve the issue 0x643 uninstalling and then reinstalling the app.

To search for 0x643 uninstall apps in Windows On the Start menu, select Settings. If the app is listed, then this 0x643, select it and then select Uninstall, 0x643 software center 1603. Follow the directions on the screen. Install the center to a folder that is not encrypted.

0x643 this method if you 1603 the error message because you try to install the Windows Installer package to a folder that is encrypted. Install the package to a drive that is not accessed as a substitute drive. Use this method if you receive the error message because the drive that contains the software that you try to install the Windows Installer package to is accessed as a substitute drive. 1603 the Security tab. If prompted, approve the User Account Control.

Click Add. The Select Users or Groups dialog box appears. Click OK. To center permissions, 0x643 software center 1603, center Edit. If not, select the Allow check box. 0x643 the Permissions dialog and return to the Properties dialog, 0x643 software center 1603.

Click Advanced. Select Change permissions. Click the Applies to 1603 and software This center, subfolder, and files. Wait for the operating software to 1603 the permissions that you have selected to all software folders.

Run the Windows Installer package.❷