RPC UNAVAILABLE ERROR When adding a printer, you may see the error, "Operation could not be completed. The RPC Server is unavailable." Typically, this means that the Spoolss.exe or Spoolss.dll has been corrupted. You'll need to replace these files with working copies. The best way to do this is by reapplying the last service pack, but you can also do it using the InUse plug-in program, as explained in a previous tip. Copy and paste this URL into your browser: download.microsoft.com/download/winntwks40/Utility/4.0/NT4/EN-US/inu_x86.exe
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