also this may be usefull
How to Get Full Administrator Rights in Windows 7 | Web Talk
i havnt had any problems with win 7 but i am running win 7 ultimate N series but incase the link wont work heres how to give total control to any account you have
1:Click Start.
2:Click Computer (you can also found this icon on the desktop).
3:Right click on the Hard Disk icon where your OS is installed on and click Properties.
4:Click the Security tab.
5:Click the Advanced tab.
6:Click the Change Permissions button located after the Permission Entries list.
7:A new window will appear on your screen. Such a window contains a list of all the user accounts available on your computer.
8:Select the user account you want to give total control over your Windows 7 and click the Edit button.
9:Now, tick the checkbox labeled “Total Control” and press OK.
Done!
unfortunatly i cant test this as i have lent out my laptop with win 7 on to my son