Software

Excel

1. Click the Microsoft Office Button Button image, click Excel Options, and then click Add-Ins.
2. View the add-ins and application extensions that are categorized as follows:
* Active Application Add-ins Lists the extensions that are registered and currently running in your Office program.
* Inactive Application Add-ins Lists the add-ins that are present on your computer but are not currently loaded. For example, smart tags or XML Schemas are active only when the document that references them is open. Another example is the COM add-ins that are listed in the COM Add-ins dialog box. If the check box for a COM add-in is selected, the add-in is active. If the check box for a COM add-in is cleared, the add-in is inactive. To learn how to open the COM Add-in dialog box, see the section called Manage the installed add-ins.
* Document Related Add-ins Lists template files that are referenced by currently open documents.
* Disabled Application Add-ins Lists add-ins that were automatically disabled because they are causing Office programs to crash.
http://office.microsoft.com/en-us/excel/HA100341271033.aspx#12

Please post back if you have any more problems or questions.