windows server 2012 cannot update

Hi!

I install and use a standard windows server 2012.

When i run Windows Update - sad me: cannot work, because the administrator use this. Not have to right to this.

I'm a system administrator (with local system account or us a domain administrator.

The GPO's Windows Update not configured or enable.

(The server run as terminal server)

In the Computer Management the Windows Update enabled and set automatic install. But not happened anything.

Please help me - in english or hungarian.

Thanks.

Rwin