Office Support

Talk To Experts

If you wish to get instant help, you can talk to our techs on chat.

How to Fix Error Code 1921?

Basically, when you try to install or update Microsoft Office returns you with this Error code 1921. Many users reported that they encountered this Error message  “ERROR 1921: Service ‘MDM’.

In this scenario, verify if you have sufficient admin privileges to stop the system services.

Error 1921 is a general problem for the Windows system.  It will stop you from being able to install “Microsoft Office” and different programs on your computer.

It has a debugging feature which is known as “Microsoft Debug Manager” which controls and fixes the error codes.

Error code 1921

Have you learned the reasons for system update failure?

There are several reasons behind the generation of this error code 1921. However, this error code particularly arises during the installation process of Office programs.  Mostly, the duplicate programs flip the outlook signatures when you open different editions in spite of the first one. We recommend you check for duplicate programs as well.

we suggest you to chat with our assured experts

One of the major problems with this error code is that Microsoft Office is a resource-based intensive Program.

  1. Firstly, click on Start > Run > Type “MMC” in the box and click OK
    Error Code 1921
  2. Then click on File > Add/Remove Snap-in > Add (in standalone tab) > OK
  3. After this, click on Services > Add
    Error Code 1921
  4. Actually, you need to click to select Local computer and then click Finish.
  5. After that, click on the Close button and hit OK
  6. In the list, right-click Machine Debug Manager and click Properties
  7. Generally, the automatic start option for this service is stopped mode and you need to turn it to ON mode.
  8. Right-click the Machine Debug Manager service, and then click Restart

However, here are some methods that can resolve this problem of yours.

Method 1: Start the Machine Debug Manager to eradicate the 1921 error code

Are you aware of the Machine Debug Manager? It is used by Microsoft Office to perform essential tasks. You shall set this service to start automatically mode. Otherwise, you may get an Error 1921 when you start it the next time.

Method 2: Try to clean the registry

A registry clean-up tool from our Assured Assist Team will always fix the critical issues with Office errors. We ensure to clean the corrupted registry entities and make your programs work. Otherwise, you require to use third-party tools to check for registry errors.

Overall, the registry stores the central database of all the system software information. This registry setting will make changes directly to the system program’s behavior.

Usually, the registry cleaners provided by third-party companies do not help you fully. Microsoft techs perform manual troubleshooting to fix the errors.

In Conclusion,

Finally, If you are still not able to resolve this Error Code 1921, we suggest you to chat with our assured experts. I am sure they will give you the best solutions completely. However, we give you assurance about your money and the service You can also visit our website for more information.

More details for this method at


Error Code 1921
chat with our Experts

Lastly, we encourage you to read about similar Error codes :

Error code 80072efe

Office error 30174

Windows Error 0x80070490

Office error 0x80004005

Office error 17029

Windows error 0x8024002d

The operation was not performed

Update Error 80073712

Error 0x800705b4 windows 10

Office support error ooxooo16fa

Error 0x800b010a support

Tags: , , ,