How to fix a Microsoft Word MSO.DLL Error

Written by thomas king
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How to fix a Microsoft Word MSO.DLL Error
Dynamic Link Libraries allow your computer to operate more efficiently. (Darrin Klimek/Photodisc/Getty Images)

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 reinstalling the Mso.dll file. To complete this task, you may need an administrator name and password.

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  1. 1

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

  2. 2

    Click "Start" and "Computer."

  3. 3

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

  4. 4

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

  5. 5

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

  6. 6

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

  7. 7

    Close the Command Prompt and restart your computer.

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