problem for change the system permission in administrator

#1
i have a problem for change the system permissions in windows 7 .First i right click the local dirve C and go to properties and click the tab (i.e) security and was change to set the permission deny for system in administrator user, so i cannot install the software in administrator.Actually i was changed the system permissions in administrator (ie) deny the permissions for system.how can i activate the hidden administrator account.actually i use the command for activate the hidden admin but the command not work ,the error occurs access is denied.and i go to try another way for set the permissions (ie) i go to start the programs->accessories-> and then i click from command prompt list, it shows multiple list i had choose run as administrator it is also cannot run within the administrator prompt then the error shows access is denied.
 


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