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Error 1921 is a common problem for Windows computers as it will continually prevent you from installing “Microsoft Office” and a variety of other programs on your system. The error is basically caused by the “Machine Debug Manager” automatically running on your system, which prevents its installer from being able to run properly. The way to resolve this error is to stop this service from running, as well as repair any possible Windows errors that may be causing the error to appear.

The way error 1921 will usually show up in this format when you try to install a program on your PC:

  • BUG 1921
  • Could not stop service ‘MDM’. Verify that you have sufficient privileges to stop system services.

The error you’re seeing basically means that when your PC tries to install its software, it’s holding back because it can’t stop a particular service from running. Windows has many “services” running continuously on your system, allowing Windows to do a number of different activities, such as keeping your Internet connected and keeping your “Start Menu” running. Although Windows services are necessary for your PC to work, they continually cause many problems to your PC that need to be fixed.

The first step to correct error 1921 is to stop the “Machine Debug Manager” service from running. This is easily done by clicking Start > Control Panel > Administrator Tools > Services. When you click this option, a screen will load with the various services your computer has running. Through the list you have, you need to find the “Debug Machine Manager” and stop it from running. This will allow your installation to begin.

The second step in fixing the 1921 error is actually the most important, because that’s where you fix the various settings that might have caused the error in the first place. The problem that is actually causing the error could very well be due to a part of your system called the “registry,” which is a central directory of information and settings that Windows uses to run. Although the registry is continually used to help keep your computer running at its best, it is also one of the most damaging parts of your system, causing Windows to continually display various errors. To prevent error 1921 from reoccurring, it is recommended that you use a registry cleaner to scan through your PC’s registry database and fix any errors you have.

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