On a computer running WinXP SP3 the following error occurs when I try to run sfc /scannow
Windows File Protection could not initiate a scan of protected system files.
The specific error code is 0x000006ba [The RPC server is unavailable.]
I've tried this on 3 separate computers with no obvious differences between them. It works fine on one of them and fails with the above error message on the other 2.
I spent most of yesterday looking for a solution without success, any help would be appreciated.
The Remote Procedure Call (RPC) service is set to automatic and is started on all 3 computers.