HI @Harish Mylappan ,
Then you can try to uninstall SQL Server completely, please refer to this: How to manually uninstall SQL Server., make sure no previous failed installation
Reinstall SQL Server and run the setup as administrator, when you come to Server Configuration Screen, please change the account name of database engine service to NT AUTHORITY\NETWORK SERVICE. or you can try to set is as "NT AUTHORITY\LOCAL SERVICE or NT AUTHORITY\SYSTEM"
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