Fixing Windows could not start the Diagnostic Policy Service Error in Windows 10

If you are trying to run a Windows Service like the Diagnostic Policy Service and encounter an error instead that says, “Windows could not start the Diagnostic Policy Service”, worry not for this post will guide you on what you can do of the Diagnostic Policy Service is not running in your Windows 10 computer.

As you know, the Diagnostic Policy Service enables problem detection, troubleshooting, and resolution for Windows components on your Windows operating system. When you encounter this kind of problem, you will also see the “Access is denied” error message. This occurs when the “MpsSvc” process does not have the permissions needed for the Registry keys. This kind of problem happens when the TrustedInstaller account is missing the permissions for a Registry key and so to fix this issue, you need to take full control and ownership of the Registry keys.

You need to create a System Restore point first before you get started. This way, you can always undo the changes you’re about to make in case anything goes wrong. Once you’re done creating a System Restore point, refer to the following instructions to fix the “Windows could not start the Diagnostic Policy Service” error.

Step 1: Tap the Win + R key combination to open the Run utility.

Step 2: Type in “Regedit” in the field and tap Enter to open the Registry Editor.

Step 3: After opening the Registry Editor, navigate to this registry path:

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesDPSParameters

Step 4: After that, look for the “Parameters” registry key and select Permissions.

Step 5: Now select your account under Group or user names.

Step 6: Next, make sure that the “Full Control” and “Read” boxes are both checked, and then click on the Apply and OK buttons to save the changes.

Step 7: Afterwards, navigate to this registry key: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlWDIConfig

Step 8: From there, look for the Config key and right-click on it and select Permissions and then click on Add and type “NT Service/DPS in the box and click OK.

Step 9: Now select “DPS” and check the Full control box, click OK and exit the Registry Editor.

Step 10: Reboot your computer and check if the error is now fixed.

Congratulations, you have just fixed the Could not start Diagnostic Policy Service error in Windows 10 all by yourself. If you would like to read more helpful articles and tips about various software and hardware visit errortools.com daily.

Now that’s how you fix the Could not start Diagnostic Policy Service error in Windows 10 on a computer. On the other hand, if your computer is going through some system-related issues that have to get fixed, there is a one-click solution known as Restoro you could check out to resolve them. This program is a useful tool that could repair corrupted registries and optimize your PC’s overall performance. Aside from that, it also cleans out your computer for any junk or corrupted files that help you eliminate any unwanted files from your system. This is basically a solution that’s within your grasp with just a click. It’s easy to use as it is user-friendly. For a complete set of instructions in downloading and using it, refer to the steps below

Perform a full system scan using Restoro. To do so, follow the instructions below.

  1. Download and install Restoro from the official site.
  2. Once the installation process is completed, run Restoro to perform a full system scan.
    restoro application screen
  3. After the scan is completed click the “Start Repair” button.
    restoro application screen
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