[Solved] How to Fix Error Code 1921?

Causes of the Error Code 1921

Basically, when you install or update Microsoft Office returns you with this error. 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 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.

Have you learnt the reasons for system updates failure?

There are several reasons behind the generation of this error code. However this error code particularly arises during the installation process of Office programs.  Mostly, the duplicate programs flips the outlook signatures when you open different edition inspite of the first one. We reocmmend you to check for duplicate programs as well.

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
  2. Then click on File > Add/Remove Snap-in > Add (in standalone tab) > OK
  3. After this, click on Services > Add
  4. Actually, you need to click to select Local computer and then click Finish.
  5. After that, click on 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 of the 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 the essential tasks. You shall set this service to start automatically mode. Otherwise, you may get an error 1921 when you start it for the next time.

Method 2: Try to clean the registry

A registry cleanup 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 to work. Otherwise, you require to use third party tools to check for registry errors.

Overall, registry stores the central database of all the system software information. This registry settings will make changes directly to the system programs behavior.

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


Error Code 1921
chat with our Experts

Although, we guarnatee you the issue fix, you must have the licensed product. Our Technicians are available  through out the clock to give you best support. 

Lastly, we encorage 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 not performed

Update Error 80073712

Error 0x800705b4 windows 10

Office support error ooxooo16fa

Error 0x800b010a support