A family of Microsoft word processing software products for creating web, email, and print documents.
You did not say what version of Office you were using before you installed Windows 10. Did you actually do a fresh installation of Windows 10 or simply allow Windows 10 to update your operating system. If you did the latter (update) your original Office software would remained on your computer, and may still be available on it as the upgrade to Windows 10 does NOT remove applications from your computer.
See:
See the Article “Why do I get a "stopped working message when I start my Office application at:
Orhttps://support.microsoft.com/en-us/kb/3091375. If that does not help, then you might remove all traces of the Office installation by downloading the fixit from the following article:
http://support.microsoft.com/kb/2739501
saving it to your computer and then running it.
Then reinstall Office by logging into www.office.com/myaccountwith your registered email address and click Install Office.
BEFORE REMOVING THE OFFICE INSTALLATION, MAKE SURE THAT YOU ARE ABLE TO LOG INTO YOUR ACCOUNT AND THAT OFFICE IS ASSOCIATED WITH IT!
If you actually have Office (locally installed) rather than the subscription version provided through Office 365, then you can't get Office through your Microsoft Account. Instead, see https://products.office.com/en-us/download-back-up-restore-microsoft-office-products