This happens due to the re-installation of MySQL again. Follow these steps:

Step1: delete all the MySQL-related files by going to add or remove programs (shown starting of the video). 

Step2: Go to the 'C' Directory, remove all these files related to MySQL, and type these paths manually if it does not show the folders:

            C:\Program Files\MySQL                     

            C:\Program Files (x86)\MySQL            
 
            C:\ProgramData\MySQL                        

            C:\Users[User-Name]\AppData\Roaming\MySQL        

Refer to this to get a clear idea: stackoverflow.com/questions/54428037/installing-mysql-and-checking-root-password-fails

Step3: Then again install MySQL following through the video carefully

Note: Carefully remove all the folders and files related to MySQL in the ‘C’ folder as those are the critical steps.

This happens due to the re-installation of MySQL again. Follow these steps:

Step1: delete all the MySQL-related files by going to add or remove programs (shown starting of the video). 

Step2: Go to the 'C' Directory, remove all these files related to MySQL, and type these paths manually if it does not show the folders:

            C:\Program Files\MySQL                     

            C:\Program Files (x86)\MySQL            
 
            C:\ProgramData\MySQL                        

            C:\Users[User-Name]\AppData\Roaming\MySQL        

Refer to this to get a clear idea: stackoverflow.com/questions/54428037/installing-mysql-and-checking-root-password-fails

Step3: Then again install MySQL following through the video carefully

Note: Carefully remove all the folders and files related to MySQL in the ‘C’ folder as those are the critical steps.