How to Fix Error Code 1921?
Error Code 1921 is a common issue encountered during the installation or update of Microsoft Office. It typically arises when system services cannot be stopped due to insufficient administrative privileges or conflicts with other programs. This guide provides solutions to resolve the problem efficiently.
Solution 1: Start the Machine Debug Manager
The Machine Debug Manager (MDM) is essential for certain Microsoft Office operations. Ensuring it is set to start automatically can help resolve Error 1921.
- Click Start, then Run, and type
MMCin the box. Click OK. - In the MMC console, go to File > Add/Remove Snap-in.
- Select Services, click Add, then choose Local Computer and click Finish.
- Locate Machine Debug Manager in the list of services.
- Right-click the service, select Properties, and set the startup type to Automatic.
- Click Apply, then OK, and restart the service.
Solution 2: Clean the Registry
A corrupted registry can lead to Error Code 1921. Cleaning the registry with a reliable tool can resolve the issue.
- Back up your registry by opening the Registry Editor (type
regeditin the Run dialog). - Export the current registry settings to a safe location.
- Use a trusted registry cleaner tool to scan and fix corrupted entries.
Note: Third-party registry cleaners may not fully resolve the issue. Manual troubleshooting by Microsoft-certified experts is often more effective.
Final Solution: Perform a Clean Boot
Performing a clean bootHow to Fix Error Code 1921? eliminates software conflicts that could prevent Office installation.
- Press Windows + R, type
msconfig, and press Enter. - Go to the Services tab and check Hide all Microsoft services.
- Click Disable all, then go to the Startup tab and open the Task Manager.
- Disable all startup items and restart your computer.
For detailed steps, refer to the official Microsoft article: How to perform a clean boot in Windows.
