Symptoms
Users who are not administrators can deactivate any COM add-in on an Office 2010 application.
Resolution
To resolve this issue, apply the following update:
2817377 Description of the Office 2010 hotfix package (Mso-x-none.msp): June 11, 2013
Registry key information
Important back up the registry for restoration in case problems occur. After you install the hotfix package, follow these steps to enable the hotfix:
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it,-
Click Start, click Run, type regedit in the Open box, and then click OK.
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Locate and then select the following registry subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Office\14.0\Common\Security\Note If you install the x86 version of Office 2010 on a computer that has the x64 version of Windows 8 installed, the registry subkey is located in the following location:
HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\Office\14.0\Common\Security
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On the Edit menu, point to New, and then click DWORD Value.
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Type DisableLMAddinOverwrite, and then press Enter.
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In the Details pane, right-click DisableLMAddinOverwrite, and then click Modify.
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In the Value data box, type 1, and then click OK.
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Exit Registry Editor.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.