Windows Installer is a core service which manages installations of everything in Windows including apps, features, and many other things. If for some reason, it breaks, you will be stuck with new installations and even upgrades of apps. In this post, we will share a list of error codes – and their solution, some pointing to our existing solution – and how to solve them.
Run Program Install & Uninstall Troubleshooter
The first thing we would suggest is to run the Program Install and Uninstall Troubleshooter to repair issues that block program installation or removal because of corrupted registry keys. This program will fix corrupted registry keys on 64-bit operating systems, which control the update data, problems that prevent existing programs from being completely uninstalled or updated, and problems that block you from uninstalling a program through Add or Remove Programs (or Programs and Features) in Control Panel
Start the Windows Installer Service
In the Run prompt, type MSIExec, and then press Enter.
If you get the Windows Installer window which tells you everything about MSIExec, then it’s all good.
If you get an error, you might have to start it manually.
Right-click on the taskbar, and select Task Manager. Switch to Services, and look for msiserver. Start it.
You can also run services.msc to open Windows Services and go to Windows Installer, and restart it.
This usually happens if the Windows Installer Engine is corrupted, installed incorrectly, or disabled. You will need to fix either the corruption or fix the configuration or enable it. The linked post also solves the issue where the Windows Installer service could not start, and gives the message as Error 5, Access is denied.