Change the administrator Password WithoutKnoing older password

If you forget your old password or any other reason and want to tease any person by changing his / her administrator password then follow these steps

1. Go to Control Panel  >>  Administrative tools  >>  Computer management  >>  Then System Tools

2. After That Go to Local user and Groups  >>  User

3. Then  on Administrator Do Right Click and then Set Password  >>  Then Click Proceed

4. Now enter your new password and press ok button. (See Images for Reference)