How to Uninstall Pre-Installed Office Programs (2026)

When you install a fresh copy of Microsoft Office on a Windows PC, you might run into activation errors, missing applications or compatibility warnings that seem impossible to explain. In the vast majority of cases the culprit is the same: leftover files and registry entries from a pre-installed or trial version of Office that the standard “Uninstall” button did not fully remove. Before you reinstall the product you have purchased fro...