Hi, Vasileios Volikakis
Thank you for using Microsoft products and posting them to the community.
Try Office's quick fixes:
Repair an Office application - Microsoft Support
If the problem persists, try the following steps:
- Please open the file I shared with you in private messages and save it as a new file on your desktop.
- Change the file extension from .txt to .cmd, then right-click and run it as an administrator. (If you can't see the file extension, press Windows + E to open File Explorer, go to Options > View, and uncheck "Hide extensions for known file types" in the advanced settings.)
- After running the file, an option will appear (yes or no); type y (yes) and press Enter.
- At this point, four options will appear; enter 2 and press Enter. Sometimes, you may need to press any key to continue (a prompt will appear).
- After option 2 has completed, enter 3 and press Enter. Again, you may need to press any key to continue (a prompt will appear).
- After option 3 has completed, enter 4 and press Enter; the command will close automatically.
- Re-download Office.
View private messages:
I hope the above information can help you. Feel free to send a message if you need further help.
Best wishes
Aiden.C - MSFT |Microsoft Community Support Specialist