Can not install anything. Access Denied.

I am advanced user. Never had any problems with any Windows computers. Now I can not fix my own problem. I can not install anything on my PC. I am allways getting errors. For example: When I am trying to install Adobe Reader, I am getting Error 1406. Could not write value tWhiteList to key \Software\Policies\Adobe\Acrobat Reader\11.0\FeatureLockDown\cDefaultExecMenuItems. When I am trying to...



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