1. Click the 'Microsoft Office' button in the top left corner of the Excel screen, select 'Excel Options' and choose 'Add-Ins.'
2. Scroll down the list of add-ins displayed in the new window until you locate the add-in you wish to disable. Make a note of the name in the Type row next to the add-in's name.
3. Select the type you noted in the previous step in the Manage box, then click 'Go.'
4. Uncheck the check box next to the name of the add-in in the new window that pops up and click 'OK.' This will disable the add-in. Repeat this process as necessary until you have disabled all the add-ins you wish removed from Excel.