If you receive Windows Update error 0x80070666 or 80070666 when you use Windows Update, you might have a previous version of Microsoft Office that is causing the error.
To resolve this problem, restart your PC, and then try checking for updates again.
If you get this error from a Microsoft Office update, then you'll need to remove and reinstall Microsoft Office.
If you continue to see this error, you can try searching the forums or asking a question on the
Error codes this applies to: