How to Repair Java Error 1721 in Windows PC

Error code 1721 is related to the Windows installer. It appears when you try to install or uninstall a program. It happens when the Windows installer is corrupt or has a problem that prevents you from installing the program you want. If you get this error message, then you cannot install the program because of another problem with the Windows Installer.

What causes Java error 1721?

What causes the "Java update installer can't run" error on Windows 10

The installer is not compatible with your version of Windows: If this problem only occurs when you try to install an older program, it may be because the program was originally designed for an older version of Windows. In this case, you can solve the problem by installing the program in compatibility mode.

Common Windows installation problem: If this problem repeats with many installers, it may be a common Windows installation problem that Microsoft already knows about. In this case, you can solve the problem by running the installation troubleshooter and applying the recommended solution.

Windows Installer service is blocked: One of the most common cases of this error is when the Windows Installer service is blocked in a suspended state. In this case, the problem can be resolved by restarting the Windows Installer service from the Services window before attempting to reinstall the program.

Damaged System File: If this error message appears every time you try to install a Java-based program, this is an indication that the underlying system file is damaged. In this case, the problem can be solved by updating all Windows components using a procedure such as a clean install or a restore installation of Windows components.

Missing Visual C++ dependencies: Another possible cause of this error when installing older programs is the lack of Visual C++ dependencies, which are not installed by default in Windows 10. In this case, you can probably solve the problem by installing the missing dependencies manually.

How to fix Java error 1721?

Perform an SFC scan

  1. Click the Windows icon.
  2. Type cmd, right-click and select Run as administrator.
  3. In the command prompt window, type sfc/scannow and press Enter.
  4. The scanning process will take some time, so please be patient.

Uninstalling programs

  1. Click the Windows icon.
  2. Go to Settings.
  3. Click on Applications
  4. Applications and features.
  5. Select the applications you no longer use.
  6. Highlight those apps and click the “Uninstall” button.

Perform a system restore

  1. Click the Windows icon.
  2. Type Create a restore point and click on it
  3. In the System Properties window, click System Restore.
  4. Select a restore point for your computer
  5. Click Search for affected apps to find apps you no longer need.
  6. Click Next
  7. On the System Restore window, click Next
  8. Click Exit.

Turn off Internet Explorer add-ons

  1. Open Internet Explorer
  2. Click the Tools tab
  3. Select Manage Add-ons
  4. In the Manage Add-ons window, click on Add-ons used by Internet Explorer.
  5. Now click each add-on displayed in the list.
  6. Click Disable and then OK
  7. You will get a message You may need to restart Internet Explorer, click OK, and close Internet Explorer for the changes to take effect.

Performing a disk cleanup

  1. Click the Windows icon.
  2. Type Disk Cleanup and click on the search result.
  3. Select the drive to clean and click OK.
  4. Under Files to delete, click the file you want to delete and click OK.
  5. If you need to clear files, click Clear system files and then click OK.

Frequently Asked Questions

  1. Press Windows + R to open Run.
  2. Type services.msc and press Enter.
  3. Right-click on "Windows Installer" and stop the service.
  4. Right-click again, start the service and try to install the program.

Error 1721 is an Install Shield error code indicating that the installation process failed.

You may be displaying a message that the Windows Installer service is unavailable. This usually happens when the Windows Installer is corrupted, improperly installed, or disabled. You will need to either repair the corruption, fix the configuration, or enable it.

  1. Click the Start button and type Services.
  2. Right-click Windows Installer, then select Properties.
  3. If the Startup Type field is set to Disabled, change it to Manual.
  4. Click OK to close the properties window.
  5. Right-click the Windows Installer service, then click Run.
  6. Try installing or uninstalling again.

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