RPC Service is unavailable

I have one server with this error "RPC Servie is unavailble".  Looke thru the solutions for this type of error and could not find anything that would help.  The server is a Windows 2003 with sp2.  Windows firewall is not enabled.  We use Syantec Antivirus.  I've tried disabling the A/V and got the same error message when I try the application that will not run because of the RPC error.
Jack SeamanAsked:
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Jack SeamanConnect With a Mentor Author Commented:
The solution did not involve the RPC service.  The application license had expired.  After I renewed the license key, I did not get the error.  Looks like this was the vendors way to get the licensed renewed that I did not know had expired.
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Kruno DžoićSystem EngineerCommented:
The RPC server is unavailable because the service couldn't function properly because it's dependency  couldn't start...  check the dependencies?
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Jack SeamanAuthor Commented:
It has no dependencies.  I checked some services that are also dependent on RPC server.  The ones I checked are running OK.  Which is odd because I would expect all service dependent on the RPC server not to be running.  I am now thinking it is something to do with the particular application that is dependent on RPC.  The name of the application is Facilities Commander.
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Jack SeamanAuthor Commented:
Since it was running ok on Oct 13 and the morning of Oct 14, Windows update was done, installing 8 patches, and later on in the day, it was reported that the application stopped running, I uninstalled all fothe updates done on 14 Oct.  However, this did not help.  Still have the problem.
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Kruno DžoićSystem EngineerCommented:
and service 'Server' is started ?
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Jack SeamanAuthor Commented:
Yes, the service "Server" is started.
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Jack SeamanAuthor Commented:
The issue was an expired license key.  Once it was renewed the application ran successfully.  The RPC service was always available.  I checked on other services that were dependent on RPC, and they were running.  I had expected that they would be failing too.  But this was not the case.  So, I started looking for other reasons.
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