You try to enable one of the following COM add-ins installed with Microsoft Excel 2013:
MicrosoftOfficePowerPivot for Excel 2013
To do this, you click Options, click Add-Ins, select Com Add-Ins in the Manage list,and then click Go. In this situation, the COM add-ins do not appear in the COM Add-Ins dialog box as expected.
This issue occurs because the registry keys that provide the add-in information to the Add-in Manager are damaged or set to invalid values. See More Information for the Office 2013 SKUs that contain these add-ins.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
Fix it for me
To resolve this issue, run the appropriate troubleshooter for the add-in:
The PowerPivot add-in troubleshooter may automatically fix the problem described in this article.
To work around this issue, follow these steps to delete the affected registry keys:
Exit Excel 2013.
Start Registry Editor. To do this, use the appropriate method for your operating system, as follows:
In Windows 7, click Start, click Run, type regedit, and then click OK.
In Windows 8, click Start, type regedit in the Start Search box, and then press Enter.
Locate the registry keys that are described in the "Notes" section that follows this procedure.
Right-click the appropriate registry entry, and then click Delete.
Exit Registry Editor.
Start Excel 2013.
Follow the steps that are described in the "Symptoms" section to enable the add-in.
Excel 2013 automatically rebuilds the registry keys.
The registry keys that you have to delete vary, depending on the add-ins that you use. You have to delete the registry keys only for the add-in that is missing from the COM Add-Ins dialog box. Each add-ins corresponds to the following registry keys, respectively:
Important: These add-ins and the Inquire add-in all require specific SKUs of Microsoft Office 2013. They are available on:
Microsoft Office 2013 Professional Plus
Microsoft Office 365 ProPlus available as a standalone subscription.
Microsoft Office 365 ProPlus available as part of the Office 365 Enterprise E3, Office 365 Enterprise E4, Office 365 Education E2, Office 365 Education E3, Office 365 Government E3, or Office 365 Government E4 offerings.