Sometimes the owner of a computer needs to change the rights of registered users in the system, for example, to change the administrator of the computer.
This can be done with standard Windows tools.
Click Start, point to Control Panel, and then click User Accounts.
When you see the window for managing your account, click the "Manage another account" button.
Select the account to which you want to issue administrative rights.
Click on "Change account type", and then select "Administrator". Confirm the changes.
In the same way, change the type of the account from which you want to remove the administrator rights.
Restart the computer (or restart).