1. Go to CONTROL PANEL
2.Look under user accounts and family safety and click on ADD OR REMOVE USER ACCOUNTS
3. At the bottom of the screen you will see create a new account, click on it and make one for yourself.
5.Do the same as step #2 but delete the old Administrator account
To change your computer name
1.click on start
2.right click on computer and select properties
and a windows will open and it takes you to control panel/system and security/system
3. Look in the middle of the page and you will se computer name, domain, and workgroup settings,
look under that and to the far right you will see CHANGE SETTINGS click it and the rest is up to you!
DELETE Windows.old folder found in the C: directory you need a program called UNLOCKER just google it