I installed a backup software program (Retrospect 7.5) running on Windows Server 2008 R2 (a domain controller). When I open it says:
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?
You can't login interactively as Local System on any system, not just a DC.
As far as I remember, you can use psexec to run a command under the local system account by passing it the -s switch.
Log into your DC as yourself, then use psexec to launch the software.
Check out http://ss64.com/nt/psexec.html for syntax.
Be careful though, although the local system account does not have privileges on the network, it will have full access to the local AD database... It's generally not a good idea to do this sort of thing if at all possible...
at the first time Download PsExec command from HERE this is PSTools ! then run this command : PsExec.exe -i -s -d "Your Program Location" this way make you to run your program with Local System Account Privilege