Due to a recent Microsoft Update, some users have found that any embedded ActiveX controls on Excel worksheets or Word documents no longer work. Not only that, they try to add new ones and they get an error message informing them “Cannot insert object”. It appears that a good fix is to simply delete the file MSForms.exd file from any Temp subfolder in the user’s profile. For instance:
Make sure that you are not running any Office application (Excel, Word…) before you do this.