Error 1721 Windows Installer Windows 10

Hi Miguel, I'm Benedict, an Independent Advisor. I'm here to help you.

Kindly try running the Program Install and Uninstall troubleshooter provided here: https://support.microsoft.com/topic/cca7d1b6-65...

If that doesn't help, try running the Troubleshoot compatibility on the installer of the software you are trying to install:

• Locate the software installer
• Right-click on it and select "Troubleshoot compatibility"
• Select "Try recommended settings"
• Click "Test the program."

Hope that helps. Please let me know how it goes.

Regards,

Benedict P.

Okay, I see. You could do it with Registry Editor, but please do it at your own risk:

• Open Start Menu
• Type regedit and open Registry Editor
• Locate this: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\msiserver
• In the left pane, click the "msiserver" folder, and in the right pane, look for the file named "Start", double-click on it.
• Change the value from 3 to 2.
• Close the Registry Editor.
• Confirm the changes by opening Services app, look for the Windows Installer service, right-click on it and select Properties.
• Now, you should see the Startup type is changed to "Automatic"

Unfortunatly the problem continue. I aplied all methods that you recomended.

I saw other cases when fix it changing type start "windows installer service" as "automatic". How can I do it?

Yes. You could try re-registering it (re-installation) using Command Prompt or restarting it in Services app, and you could see the steps of doing those methods and other possible methods regarding Windows Installer service issues here: https://windowsreport.com/windows-installer-ser...

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Also, kindly check if there are pending updates to install in the Windows Update settings. If so, please download and install the update(s).

If the issue still exists, try to use the System File Checker tool to repair missing or corrupted system files:

https://support.microsoft.com/en-us/topic/use-t...

If that doesn't help also, try doing a repair upgrade. This will reinstall Windows 10 with the option of keeping your files and all installed apps including third-party apps.

Just go here: https://www.microsoft.com/en-us/software-downlo...

And under "Create Windows 10 installation media", click the "Using the tool to upgrade this PC to Windows 10" to show more information and guidelines on how to do the repair upgrade.

It will only take time to download the installation files and reinstall Windows 10 on your PC. And this will restore and fix all corrupted system files. Also, after the process of repair upgrade, you have to download and install system updates in Settings > Windows Update settings. Please see if that would sort the Windows Installer error.

Hi Benedict, thank you for your help, but the problem continue. Can I reinstall "Windows Installer"?