error 429 activex component can't create object, excel add-in, Window 7

error 429 activex component can't create object, excel add-in, Window 7 I had this strange error today. I repaired Office 2010 and reinstalled the program containing the add-ins. I even used a brand new build and still got this error. Look up this error and there are any number of possible causes. Turned out that the add-in was 32-bit and only worked with the 32-bit version of Excel. So I had to uninstall 64-bit Office and then install 32-bit Office. Finally, it worked!