MS is pushing Office *64 bit* version as the default install now for office 365 installs and its creating havoc with many customers. A major software update is meant to be carefully planned and not just forced on us by Microsoft..
If you are looking for maximum compatibility install the 32 bit version of Office (regardless of your Windows version) details here https://digitalwelcomemat.com/index.php/how-to-guides/51-how-to-install-microsoft-office-from-the-web-office-365-version