To change ownership, right-click any file or folder, select Properties, and go to Security tab. Now click the Advanced button(shown in the screenshot below).
Next, you need to go to Owner tab and hit the Edit button. Then in the new dialog window choose the new owner and then click OK.
Regarding the Build in administrator i would works on Home Edition as well just try the Option 2.
Option Two
Through a Elevated Command Prompt
NOTE: This option can be used in all editions of Windows 7.
2. To Enable the Hidden Built-In Administrator Account -
A) In the elevated command prompt, type
net user administrator /active:yes and press Enter. (See screenshot below)
B) Go to step 4.
3. To Disable the Hidden Built-In Administrator Account -
A) In the elevated command prompt, type
net user administrator /active:no and press Enter. (See screenshot below)
4. Close the elevated command prompt.
5. Log off, and you will now see the built-in Administrator account log on icon added (enabled) or removed (disabled) from the log on screen. (See screeenshot below)
NOTE: Click on the Administrator icon to log on to the built-in Administrator account.
Hope this helps,
Captain