When we want to change root password in windows, We need to follow following steps :

Step 1 : Start your Command Prompt by using any of below method :

Perss Crtl+R or Goto Start Menu > Run and then type cmd and hit enter

Step 2 : Change your directory to where MYSQL is installed, In my case it’s

C:\\> cd C:\\mysql\\bin

Step 3 : Now we need to start mysql command prompt

C:\\mysql\\bin> mysql -u root mysql

Step 4 : Fire query to change root password

mysql> SET PASSWORD FOR root@localhost=PASSWORD('my_new_password');