I installed a backup software program (Retrospect 7.5) running on Windows Server 2008 R2 (a domain controller). When I open it says:

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> Retrospect could not be started under the specified user account (DOMAIN\Administrator) and is running under Local System instead. This can be corrected in Configure>Preferences>Security.
> 
> 
> 

If I go there, everything is greyed out and unchangeable. Is it possible to login to the domain controller as "Local System"? If so, how?