To do this:  Launch the Command Prompt: for this Click the Start button, type “cmd” within the search box, next then right-click Command Prompt and finally select “Run as administrator”.  Register DLL File: For this you need to type the following command in the Command Prompt window and press Enter: “regsvr32.exe /u C:\\Program Files\\Common Files\\Microsoft Shared\\OFFICE14\\MSO.DLL”. Replace “C:\\Program Files\\Common Files\\Microsoft Shared\\OFFICE14\\MSO.DLL” with the path to the MSO.DLL file on your device.  To Confirm success: You will receive a message that states “DllUnregisterServer in C:\\Program Files\\Common Files\\Microsoft Shared\\OFFICE14\\MSO.DLL succeeded”. Re-register DLL file:For this you need to  repeat the above steps, however replace “regsvr32.exe /u” with “regsvr32.exe”.  Finally Restart Excel: Shut Excel and reopen it to make sure the registration changes have taken the required effect.