Hi Hussain R,
My name is Tim and I’m sorry to see you’re experiencing issues. I will gladly assist you today.
Is the version you’re using up to date? If not please update and if it is please continue to repair office as per below:-
Please right click on the start button located on your task bar.
Select apps and features
Select the Microsoft Product you wish to modify, in this case
Depending on your version of Office you will either be asked “How would you like to repair your office programs” Select Online repair.
Or either Change your installation, select repair and then continue.
The below link is a Microsoft Support Document that you can refer to if needed. An online repair can take a considerable amount of time which is completely normal.
https://support.microsoft.com/article/7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b
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If you require any further information then please don’t hesitate getting it contact. I will be more than happy to assist you further.
Kind regards
Tim