A family of Microsoft word processing software products for creating web, email, and print documents.
If you start Word in Safe mode, for the purpose of troubleshooting, then what do you see?
Here's how to start in that mode: Exit Word if it is currently running. Hold the Windows logo key as you restart Word, and click yes when asked about Safe mode.
If Safe mode works, that points to three causes of trouble, which you can investigate in order: (1) a faulty add-in interfering with Word's normal operation, (2) a damaged Normal template, or (3) corrupt registry entries for Word. For more on troubleshooting add-ins, renaming the Normal template and deleting registry entries, see https://support.microsoft.com/en-us/kb/921541.