Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
There are situations in which you may need to delete registry keys for Office products. In such situations, you would delete only subkeys for a specific product. After you do so, the product will recreate the deleted key with the default settings the next time that you open it. For example, for details about when and how to delete registry keys for Word, see http://support.microsoft.com/kb/921541/en-us . If this doesn't help, write back and tell the forum why you want to delete a registry key, for which Office product or products, and what you have tried.