What exact Word version? Can you provide a Report ID?
You should go to your Word Startup folder, delete Zotero.dotm, restart Word to confirm that Zotero is gone completely from Word, and then follow the steps in Zotero Toolbar Doesn't Appear. This will make sure you're running the latest version of the plugin for Zotero 7.
Upgrade Storage
You should go to your Word Startup folder, delete Zotero.dotm, restart Word to confirm that Zotero is gone completely from Word, and then follow the steps in Zotero Toolbar Doesn't Appear. This will make sure you're running the latest version of the plugin for Zotero 7.