Hello, a colleague of mine mistakenly denied administrative rights on a c:\ drive in windows server 2012 r2. He right click the c drive then properties, from the security menu, he wanted to deny a user but he mistakenly deny Administrator and since then the c:\ has denied access to everyone and access to active directory users and computers has been dienied likewise. access to MMC is also denied by the system. How can i reset the permissions or rights on the c:\ dirive. Thanks
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