What is MoUSO Core Worker Process

MoUSO Core Worker Process (MoUsoCoreWorker.exe) is a Windows service responsible for managing the sequence on which updates are downloaded and installed onto the operating system. In other words, it helps Windows determine which update will be installed in the first order. As a rule, this service gets itself running only when scanning for updates. However, in certain cases, users may see it continue its operation for an extended period of time for no obvious reason. As a result, this may lead to higher consumption of CPU, RAM, or/and Disk usage, making your computer laggier and slower to use even for simple tasks. The most popular causes for the unusual behavior of the MoUSO Core Worker Process are that it or other update-related services could become temporarily bugged, there are pending updates, or, in rarer cases, your system is infected with malware that mimics the MoUSO Core Worker (MoUsoCoreWorker.exe) process. Follow our guide below and try all the suggested methods to potentially resolve the high memory/CPU/disk usage. Note that instructions in our guide were made on the basis of Windows 11, keep in mind that they may vary slightly on Windows 10.

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1. Run Windows Update Troubleshooter

Unless you tried this already, we recommend you start your fixing journey with the in-built Windows Update Troubleshooter. Despite a notoriously low impact on resolving such issues, sometimes this feature can succeed nonetheless and save you quite a barrage of time. Let it try to detect update issues and resolve them immediately with these steps:

  1. Open Settings from the bottom taskbar.
  2. Choose System on the left and go to Troubleshoot > Other troubleshooters on the right pane.
  3. Then, find Windows Update and click Run next to it.
  4. Finish the process following the on-screen instructions and restart your PC.

After this, check whether the resource consumption has changed. If this does not work, go further below to try other solutions.

2. Scan your system for malware

Malware like trojans are known to impersonate the names of Windows processes to hide their malicious activity. As a result, the presence of malware can drive the usage of CPU/RAM/Disk or other resources to go high causing downgraded system performance. Thus, if you suspect that malicious software could sneak into your system without consent, you should then scan your system using either in-built Windows Defender or advanced anti-malware software that will combat threats that Windows could miss. We recommend you to use an antivirus developed by Malwarebytes – a trusted and talented group of experts constantly maintaining their software to combat both minor and global threats. It is now available for Windows 11 as well. You can download it using the link below and try a 14-day trial of the ultimate antimalware experience completely for free.

3. Download and install all pending updates

Manually installing all the pending updates should help since it will prevent MoUSO Core Worker Process from performing its main function – that is to manage the order of available updates. You can do so using the steps below:

  1. Right-click on the Start Menu button at the bottom taskbar of your desktop and choose Settings. You can also press Windows Key + I buttons instead.
  2. Navigate to Windows Update and click Check for updates.
  3. Wait until Windows finds new updates and click Install now. If new updates were already pending, you can install them immediately without searching for them.
  4. To finish the installation of updates, Windows may ask you to restart your PC. Do so if required by clicking Restart now.

4. Pause Windows Updates

Alternatively to installing all the pending updates, you can also remove the need for MoUSO Core Worker Process to hustle around managing uninstalled updates by simply pausing them in updates settings. This action should be able to prevent the MoUSO Core Worker Process from actively running and reduce consumed resources. If you need a temporary solution and can get around without installing new updates, then this solution is a good one to consider. Follow the steps below:

  1. Right-click on the Start Menu button at the bottom taskbar of your desktop and choose Settings. You can also press Windows Key + I buttons instead.
  2. Navigate to Windows Update.
  3. Next to Pause updates select how long you want to pause updates. For instance, choose Pause for 5 weeks.
  4. After this, check if the behavior of MoUsoCoreWorker.exe has changed.
  5. If you want to resume updates in the future, simply click on the Resume updates button.

5. Disable Delivery Optimization

This feature allows users to obtain updates from other PCs that operate within the same network. Having this feature enabled may obviously lead to increased work for the MoUSO Core Worker Process and consumption of system resources respectively. Please note that before disabling this feature, it is recommended to install all the pending updates. Once done, do the following:

  1. Press Windows key + R buttons together and copy-paste regedit into the field. Click OK or press Enter to open Registry Editor.
  2. On the left pane, navigate through this path HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DoSvc.
  3. Once you reach the DoSvc folder, click on it to select.
  4. Then, on the right pane, right-click on an entry called Start and choose Modify.
  5. Type in 4 under Value data and click OK.
  6. Finally, close Registry Editor, restart your PC, and see if this has positively affected the consumption of resources.

6. Restart Windows Update and Update Orchestrator Service

As mentioned, it is possible that MoUSO Core Worker Process became bugged for some reason. If none of the methods above worked, you can try to restart both Windows Update and Update Orchestrator Service which are responsible for update-related functions. Doing is the last resort method to help you resolve the issue with excessive consumption of resources. In addition, you can also try to not restart but disable Update Orchestrator Service separately. This will simply discontinue the functioning of MoUsoCoreWorker.exe and should restore the normal level of resource consumption. Please note that doing so will also prevent your system from looking for new updates and making them available for installation.

To restart Windows Update and Update Orchestrator Service:

  1. Press Windows key + R buttons together and copy-paste services.msc into the field. Click OK or press Enter to open it up.
  2. Then find Update Orchestrator Service among all services on the list, right-click on it, and choose Restart.
  3. Do the same procedure with Windows Update and go to your Task Manager to see the resource consumption after completing these steps.

To disable Update Orchestrator Service:

  1. Open the Services window as we did above and find Update Orchestrator Service.
  2. Right-click on it and choose Properties.
  3. In General tab make sure Startup type is set to Disabled.
  4. Once selected, click Apply and OK to save the changes.
  5. Finally, go to Task Manager and check how your resource consumption is doing.

If MoUSO Core Worker Process continues to run in Task Manager despite the above steps, simply right-click on it and choose End task to stop it from running.


We hope our guide ended up being useful in resolving excessively high consumption of CPU, RAM, or/and Disk resources on your Windows PC. If you need assistance with solving other computer errors or even threats, such as malware, feel free to search for the corresponding articles on our website. Each day we update it with articles related to resolving both old and new computer errors and threats that affect users.

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