SQL Server 2014 - Windows could not start SQL server on local computer

I have an AWS instance, on which SQL Server 2014 has been running for more than 3 years.

But a few days ago, suddenly the SQL Server stopped running.

I checked the server and tried to start SQL Server service from services, from SQL Server Configuration Manager etc. but I'm not able to start the server and got following error:

So I checked event viewer entries and I found these two errors:

I started some research work over web to overcome on this issue and I found that I can start SQL service using below command using T902:

net start MSSQL$REVCORD /T902

And SQL Server service started successfully.

But I want to make SQL Server / services back to normal as before so I can start / stop services normally.

I found on web that this cause is due to corruption in master SQL Server database, I don't have backup of master SQL Server database so I cannot restore it back.

I checked multiple threads over web and tried multiple things to overcome this issue but no luck.

So finally I decided to reinstall/recover SQL Server 2014, but I am getting another error while reinstalling:

Based on finding over web, all threads showing that I have to uninstall and reinstall SQL Server to make it normal again.

Please help! It's a live server with multiple calls continously so I cannot uninstall/reinstall SQL Server there due to possible data loss.

The first thing:

select * from sys.sysmessages where error = 5833

The message:

The affinity mask specified is greater than the number of CPUs supported or licensed on this edition of SQL Server.

Check your edition, and fix the affinity mask so that the number of CPUs satisfy the number which is supported by your edition. You can fix it in SSMS on the Processors tab in your server properties, or using sp_configure