In system settings 15 item are not accessible, get the message: cannot open it, is not possible on intel based MAC. Items like security, i cloud user and groups network and more

in system settings 15 item are not accessible, get the message: cannot open it, is not possible on intel based MAC. Items like security, iCloud user and groups network and more.
Genius bar told me to erase the harddisk and install OSX Maverick again. This has not changed the problems with the system settings

You need to Repartition the drive as One partition which will erase all data from it and then reinstall OS X. then with the initial setup system you chose the language on the first screen that comes up. That sets the language for the whole system.
There is no other way of completely removing certain information created by a previous owner. this hold strue whether you are selling or give a Mac to someone.
To do the repartitioning you need to use the Online Internet Recovery system, if the Mac came with Lion 10.7 or above, or from the original system reinstall discs that came with it when it was new.

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