Check this step-by-step video guide about resetting password of the root user in MySQL server on Windows operating system.
I'd like to share with you the proven steps to reset MySQL root password on Windows computer:
The last resort if you forgot your root password and can’t remember it
No need to use old password
Tested and worked with local MySQL server on Windows
Easy to follow
I also add some notes in case it won't work for you for the first time. Maybe something wrong and you have to correct it.