How to give admin rights to the User Accounts?

Log In with administrator Account in to the computer.
Right button click on My Computer icon and select Manage.
You can see a new window named as computer management.
Then click on Local users and Groups and select Groups.
In right side window you can see Administrators click right button on that.
Then you can see the add to group name click on that.A new window will open named as Administrators Properties.
Click on add button then the next window add the user name.
Then click on check names.
Your name will appear the window and click OK.
Then click on Apply button and click on OK.
The window will close now then Log Off the computer and log in with your User name.
You will have all admin rights.