WMI Error- The RPC server is unavailable

This error can be caused by a variety of things. Usually, there is either an error in the WMI subsystem, or the remote system has a group policy configured which does not allow remote access to the WMI. The easiest way to start troubleshooting this issue is to run WMIC on the server you want to query. If you can access WMI locally, then it is probably a group policy setting.

As an alternative, there are other programs which can be used to remotely gather data from a Windows system which do not rely on the WMI or access it in different ways. Usually these are run with PSexec and then the program you want to use. (http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx) In general, the range of sysinternals tools run well and provide a much wider range of data in a better format than straight WMI queries. They can be found at http://technet.microsoft.com/en-us/sysinternals/bb842062.aspx .

I had this problem when I was setting up Spiceworks (which I love). This article/batch file helped fix many of these issues http://community.spiceworks.com/topic/35977

I ran the script but it did not fix the problem.

I ran the WMI Diag toll from Microsoft and there were errors in the logs, any ideas?
WMIDIAG-V2.0-6001-.SRV.RTM.32-TY.TXT