Name change doesn't stay?

I change my computer name and it just changes back to my old one as soon as I sign in? I tried in settings & also tried Windows+R (msconfig/http://ift.tt/29a8LBp) and it just keeps going back to my old name! At first it shows up but as soon as I enter my password it changes right back to it and I check all the settings I changed & it's my old name. Can somebody help me? -.-

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