Microsoft Office 2016 keep on re configuring on opening word/excel/powerpoint etc every time. How do I stop this?

Do you have more than one version of Office installed on the same machine?

Initially I was working on Office 2013 after removing it & installing the Office 2016 I am getting this problem of re-configuring every time I open any utility.

Exit Word if it is currently running. Hold the Windows logo key and type winword. In the list of search results, right-click Word and choose the option to Run as Administrator (provide a password if required). Let the configuration finish and then see if you are able to start Word normally.

Try starting an Office repair from Control Panel. See https://support.office.com/sv-se/article/Reparera-ett-Office-program-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b#ID0EAADAAA=Windows_7_eller_Vista.

If it still fails, you may have to remove Office manually and reinstall. See https://support.office.com/en-us/article/Uninstall-Office-from-a-PC-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8.

I worked as per your suggestion but still the problem persists. On opening word or other utility, reconfiguration process starts again. If i cancel this reconfiguration, a message is popped out asking to repair the office. If I again cancel this repair message than only the word starts.