Fix Windows 10 Installer Error 1721 (Smart Tips 2024)

Windows users may encounter a few problems when installing Java or other applications. One of these issues is Error Code 1721 in the in the Windows installer.

This error usually occurs when you are trying to install or uninstall a software program or if the computer cannot read certain files. This error appears.

Error 1721. There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor.

As you read this article, it is possible that you are one of those users who have encountered this issue and are looking for a solution.

This article will provide you with solutions to Windows 10 installer error 1721.

What are you still waiting for? Let’s get started…

Check Article: Fix Windows 10 Update Error 0x80070490

How to Fix Windows 10 Installer Error 1721?

There are several solutions that you can use to fix Windows Installer Error 1721 and start the installation again.

Solution 1: Disable Internet Explorer add-ons

You can solve the installer error 1721 by disabling Internet Explorer add-ons. To do this, follow the steps below:

  • Open Internet Explorer.
  • Click on the Tools tab.
  • Select Manage Add-ons.
  • Click on Addons used by Internet Explorer.
  • Click on each of the add-ons in the list.
  • Click Disable, then Ok.
  • The message will appear. To make the changes take effect, you may need to restart Internet Explorer. Click OK, and then close Internet Explorer.

Start your computer again, install a new program, and then check whether the error 1721 in Windows 10 is still present.

Solution 2: Try Disk Cleanup

The disc cleanup utility is an essential tool to maintain your computer. It will remove the files that are causing the Installer Error 1721.

Follow these steps to perform disc cleaning:

  • Click the Windows icon.
  • Click on the search results for disk cleanup.
  • Click on Ok to clean the selected drive.
  • Click on OK after selecting the file you wish to delete.
  • Click on Clean up system files to do so.

Try installing a program after performing a disc clean-up to see if the error 1721 Windows installer has been fixed.

Solution 3: Perform System Restore

Windows 10 Installer Error 1721 can be eliminated by performing a system restore.

Follow these steps to restore your system:

  • Click the Windows icon.
  • Click on the restore point created by typing
  • Click on System Restore in the System Properties window.
  • Choose the restore point for your computer.
  • To remove apps, click on Scan affected programs.
  • Click on Next.
  • Click on Next in the System Restore window.
  • Click on Finish.

After completing the steps above, your computer will return to its original state. You will no longer be faced with the Installer Error 1721.

Solution 4: Re-Register the Installer

The solution is easy. You just need to register the Windows installer again on your system, and the error 1721 should disappear.

Follow these steps to reregister the installer.

  • Start Windows in safe mode and with admin privileges.
  • The Windows icon will appear.
  • Click on Run this program as an administrator and type cmd.

Type the following command in the Command Prompt window and press Enter after each command:

msiexec u/unregister

msiexec /register

Close the command prompt.

This will fix the error 1721 in Windows 10.

Solution 5: Run SFC Scan

It is possible that the Windows 10 installer error 1721 appears due to missing or damaged Windows files.

It is recommended to run the system file checker to repair these files. To run the SFC scanner, follow these steps:

  • Click the Windows icon.
  • Click on Run this program as an administrator and type cmd.
  • Type in the command prompt and press the Enter key.


  • Please be patient, as this process may take some time.

Restart your Windows after the scan is complete to see if error 1621 Windows installer has been resolved.


So, that’s it…

It was about how to fix an error 1721 in Windows Installer. I have listed the solutions to troubleshoot installer error 1721.

Take the easiest way to fix the problem if you have difficulty performing the manuals.

This article is designed to answer all of your questions.

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