Fixed error 1603 or 0x00000643 when installing or upgrading Microsoft Edge

Microsoft’s history with web browsers isn’t all that exciting. With the launch of Microsoft Edge in 2020, Microsoft really tried to outdo itself, and, well, we wouldn’t mind saying that it succeeded this time.

The new Microsoft Edge comes with a handful of useful features and, most importantly, it’s a far cry from Internet Explorer. It is unique in appearance and the performance is much better than expected.

It also supports a wide range of extensions available for the Google browser. Therefore, we can assume that Microsoft Edge is a useful alternative to Chrome.

Unfortunately, several users have reported errors 1603 or 0x00000643 when installing Microsoft Edge on their PC. If you were unable to install Microsoft Edge on your PC and the error 1603 or 0x00000643 appears on your screen, you have come to the right place.

Want to know how to fix Microsoft Edge installation error 1603 or 0x00000643 or update on your PC? This guide will walk you through the process of fixing the 1603 or 0x00000643 error on your PC.


What are the causes of error 1603 or 0x00000643 when installing or updating Microsoft Edge?

What are the causes of error 1603 or 0x00000643 when installing or updating Microsoft Edge?

When you install or update Microsoft Edge, you may experience a 1603 or 0x00000643 error.

  • They can occur due to corrupt registry keys in Windows 10. In this article, we will show you how to fix these errors.
  • In addition to registry problems, it happens because of problems with installation services.

Microsoft recommends that you report this problem as soon as it occurs. You should also run these suggestions as an administrator.


How to fix error 1603 or 0x00000643 when installing or updating Microsoft Edge

How to fix error 1603 or 0x00000643 when installing or updating Microsoft Edge

Do pre-run checks

Like Windows 10, the new version of Microsoft Edge, which runs on the Chromium engine, is also prone to installation and upgrade errors. While these errors aren’t too common yet, there are two that have been popping up a bit more frequently lately – Error 1603 and 0x00000643. Fortunately, like most other Windows errors, these two errors can be easily fixed with a few simple troubleshooting steps.

Before you start, make sure that you perform the following pre-run checks to fix any minor issues that may be preventing Edge Chromium from installing or updating on your computer. First, make sure you scan your entire system for viruses, malware, third-party software, etc. If you have, make sure that you also run a registry cleaner.

Once you’ve done the pre-run checks, try reinstalling or updating Edge Chromium. If the installation or update still fails, continue as described below.

Run the diagnostic program to install and uninstall Microsoft programs

Now that the preliminary checks are complete, you can move on to more complex troubleshooting.

  1. The first step is to download and run the Microsoft Program Install and Uninstall Troubleshooter, which you can download here.
  2. Once you have the tool installed on your computer, simply follow the instructions in the tool and it will look for and fix any problems it encounters.
  3. If you don’t choose the second option that will allow you to fix any problems manually. If the tool failed to fix Edge Chromium error 1603 or x00000643, go to the next step.
Re-register the Windows installation service

If nothing was working until now, it’s a good idea to re-register the Windows Installer service. This will fix any problems in the registry and return the installer to its default settings.

To do this, open a command prompt (as administrator) and then copy and paste the following commands to the command line, pressing the Enter key each time.

%windir%system32msiexec.exe / unregister
%windir%system32msiexec.exe / reg server
%windir%syswow64msiexec.exe / unregister
%windir%syswow64msiexec.exe / reg server

Once you are done with the tool, check if you can install/update Microsoft Edge Chromium. If you can’t, try one of the Edge alternatives that you can download.

Enable Trusted Installer

TrustedInstaller.exe is Windows 10’s installer service process, whose main function is to allow you to install, uninstall and modify Windows updates and additional system components. Follow this guide and make sure that it is in automatic mode.

Troubleshooting the Windows Installer

The problem is also related to the Windows Installer. If Microsoft Fix couldn’t fix the installer problem, we recommend fixing it manually. There are two solutions for this.

  • Follow the instructions for Windows Installer not working or we reset the installer service.
  • You can also run Windows Installer in safe mode.


Frequently Asked Questions

  1. Close the background software.
  2. Make sure the software is not already installed.
  3. Make sure there is enough space on your hard drive for the software.
  4. Open the troubleshooter to install and uninstall it.
  5. Remove temporary files from the Windows Temp folder.
  6. Restart the Windows installation service.

Microsoft has begun automatically deploying the new Edge browser with Windows Update for customers running Windows 10 1803 or later. You can uninstall New Edge by performing a system restore to the date prior to installing New Edge.

Error number 1603 is a Windows error that occurs during installation when a security policy is enabled on your computer. You can configure the setting to allow you to install, but you must be logged in as an administrator to make changes. To check: If you are an administrator, it will appear under your name.

Select Edit Settings -> Allow Other Apps. Add "%ProgramFiles(x86)%MicrosoftEdgeUpdate MicrosoftEdgeUpdate.exe" for 64-bit machines or "%ProgramFiles(x86)%MicrosoftEdgeUpdateMicrosoftEdgeUpdate.exe" for 32-bit machines, where is the highest number in the Edge Update folder.