How to fix a Microsoft Word MSO.DLL Error

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Mso.dll is a dynamic link library created by Microsoft and used by the Microsoft Office programs. Mso.dll errors appear as pop-up windows that generally state something along the lines of "Mso.dll was not found" or "Mso.dll is missing." Generally, these errors are caused by a missing or corrupt mso.dll file and can be fixed by re-installing the Mso.dll file. To complete this task, you may need an administrator name and password.


Step 1

Download Mso.dll onto your desktop from one of the many online dynamic link libraries at and

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Step 2

Click "Start" and "Computer."

Step 3

Double-click "C: Drive," "Windows" and "System32." The System32 folder opens.


Step 4

Drag the Mso.dll file on your desktop into the System32 folder.

Step 5

Click "Start," type "cmd" into the search field and press "Enter" to open the Command Prompt.



Step 6

Type "regsvr32 mso.dll" (without the quotation marks) into the Command Prompt and press "Enter."

Step 7

Close the Command Prompt and restart your computer.

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