Setup And Upgrade :: Failed To Run Patch Request For Instance

Having an issue updating SQL Server 2012 RTM Standard  to CU3.I'm getting the following error from the Detail log on each try: "Error: Failed to run patch request for instance: MSSQLSERVER (exit code: -2061893565)"I've tried rebooting the server, ensuring the user running the installer is a local admin account, ran the repair wizard on the SQL install...Nothing seems to work.I have two identical servers, the first has gone smoothly, this is bugging me...

Server: Dell R720XD, Dual E5-2643 CPU, 64Gb RAM, Windows Server 2008 R2 Enterprise x64, SQL Server 2012 RTM CU2 x64 Installed.

Final result: The patch installer has failed to update the following instance: MSSQLSERVER. To determine the reason for failure, review the log files.
  Exit code (Decimal):           -2061893565
  Start time:                    2012-09-17 16:25:32
  End time:                      2012-09-17 16:28:41
  Requested action:              Patch

Instance MSSQLSERVER overall summary:
  Final result:                  The patch installer has failed to update the shared features. To determine the reason for failure, review the log files.
  Exit code (Decimal):           -2061893565
  Start time:                    2012-09-17 16:27:21
  End time:                      2012-09-17 16:28:39
  Requested action:              Patch

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