. Go to control panel from start button

2. Select Programs and features there to reach a list of installed programs on your computer (In windows 10 you can just type “programs and features in the Cortana search bar beside windows start logo)

3. From the list, search for Microsoft Office 365/2021 product and click on Change

4. A window will open like here showing Add, Repair, Remove options

5. Then proceed to with repair and wait for sometimes. Once the repair is successful you are ready to use Microsoft office product again

6. To uninstall follow the first 4steps from the repair process, and choose to Remove instead of repair