7 Ways to Fix “This Installation is Prohibited by System Policy” Error on Windows

When installing certain files on Windows, an error message stating “This installation is prohibited by system policy” may appear.

Does this error appear on someone else’s device? If so, you should ask permission before following these tips. Indeed, some users disable the installations to protect their devices from security threats.

Does the error message appear on your own Windows device? If so, chances are you have configured some settings unknowingly. Otherwise, the problem is caused by some bugs on your device.

Now, here’s how you can fix this “installation” issue on Windows.

1. Enable Windows Installer Service

You will likely encounter various installation issues if the Windows installer is disabled. In fact, you might even have trouble deleting apps from your PC if this tool is disabled.

Thus, you can resolve the “installation is prohibited by system policy” issue by ensuring that the Windows installer is enabled. Here are the steps you need to follow:

  1. Hurry Win + R to open the Run Command dialog box.
  2. Type services.msc and press Walk in to open the Services window.
  3. Scroll down and double click on the Windows Installer option.

Then click on the Windows Installer startup type drop-down menu and select Manual. From there, press the Begin button to activate the service. Finally, click Apply then click OKAY to save these changes.

2. Configure settings in Local Group Policy Editor

You can also use the Local Group Policy Editor (LGPE) to resolve this issue. However, this method will only be useful if you are using Windows Pro, Enterprise, and Education editions.

If you are using Windows Home, you can check out some tips on how to run LGPE on Windows Home.

Now, here is how you can fix the “installation is prohibited by system policy” error using the LGPE:

  1. Type Edit Group Policy in the Start menu search bar, then select the Best Match.
  2. Move towards Computer Configuration > Administrative Templates > Windows Components > Windows Installer.
  3. Double click on the Disallow non-admins to apply vendor-signed updates option in the right pane.

Select Disabled Where Not configured in the upper left corner. Finally, press Apply then press OKAY to save these changes.

From there, apply the same settings to the Disallow user installations and disallow removal of updates option on the LGPE.

3. Use Microsoft’s Install and Uninstall Programs Troubleshooter

The Microsoft Programs Install and Uninstall Troubleshooter can also help, especially if corrupt registry keys are causing the problem.

Here are the steps to run this tool:

  1. Download the Install and Uninstall Programs Troubleshooter from the Microsoft website.
  2. Double-click the installed file to run it.
  3. Click it Next button then select the Facility option.

From there, select the problematic app and then click on Next. If you cannot find the faulty application in the list, click on the Not listed option and manually search for the program. From there, follow the on-screen steps to complete the process.

4. Install your apps in safe mode

Installing your apps in safe mode can also help resolve the “installation is prohibited by system policy” error. This method can be useful if faulty software is causing the error.

Here are the steps to install apps in safe mode:

  1. Type Settings in the Start menu search bar and select the Best Match.
  2. Select Update and security then click on the Recovery option.
  3. Click it Restart now button under the Advanced start option. Your PC will reboot into the recovery environment.

On the next screen, click the Advanced options and select the Startup Parameters. Finally, press the To restart button and click the F4 key to start your PC in safe mode.

If you no longer encounter the error, it is safe to say that a faulty software program or device driver is causing the problem.

5. Isolate Faulty Programs by Performing a Clean Boot

If you suspect that some faulty programs are causing the problem, you can perform a clean boot. This method helps isolate programs that may be causing this error and other system problems.

The device boots with all third-party apps disabled when you perform a clean boot. Moreover, the clean boot feature ensures that only a few critical drivers are running when you start the device. Thus, this process ensures that there are no interruptions when you install or uninstall software.

If faulty drivers are causing the problem, all you need to do is update or reinstall those drivers. Alternatively, if a faulty app is causing the problem, you can remove it and its leftover files using a third-party uninstaller.

6. Reregister Windows Installer Service

Re-registering the Windows Installer service can sometimes be the best solution. Here are the steps to re-register this tool:

  1. Type Command Prompt in the Start menu search bar. Then right click on the Best Match result and select Execute as administrator.
  2. From there, type the following command and press Walk in to temporarily “unregister” the Windows installer:
msiexec /unreg

When this process is complete, type the following command and press Walk in to re-register the Windows installer:

msiexec /regserver

Wait for the process to complete and then restart your device to save these changes.

7. Configure Settings in Registry Editor

As a last resort, you can fix this problem by configuring a few settings in Registry Editor. However, be sure to back up the registry before proceeding.

Now, here is how you can fix the problem using Registry Editor:

  1. Type Registry Editor in the Start menu search bar and select the Best Match.
  2. Type Regedit then press OKAY to open Registry Editor.
  3. Move towards Computer > HKEY_LOCAL_MACHINE > Software > Policies > Microsoft > Windows > Install.
  4. Double click on the Disable MSI value in the right pane.

Put it on Value data at 0 (zero) then press OKAY. Close the Registry Editor then restart your device to save these changes.

Install apps on Windows without any limitations

Windows installation errors can be quite frustrating. Just when you are about to download an interesting application, you encounter error messages such as “This installation is prohibited by system policy”.

The good news is that you can troubleshoot most installation issues with the Microsoft Program Install and Uninstall Troubleshooter. If not, the other solutions we’ve covered should help you resolve the problem in question.

About Irene J. O'Donnell

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