If you want to hack A computer’s Administrator that is very easy.
If you are logged in to computer with some other account here are the steps:
1. Go to Start button click on run
2. Type CMD and press enter
3. A command window will open
4. Type net users
5. This will show you all the users of that computer.
6. Now type net user administrator * and press enter
7. This will ask you to enter a password
8. Enter the password you want to keep for the administrator
9. Re-enter your password to confirm it.
You have changed the password of computer administrator. Now you can logoff that user and can login as administrator with the password you have kept.