Nothing like a service pack to fix all your problems, or in the case of SCCM 2012 SP1 create some new ones for you. After
Tag: Service Pack 1
Microsoft Remote Differential Compression (RDC) library must be registered for Configuration Manager site server installation error when upgrading to SCCM 2012 SP1
Here’s one I encountered the other day when attempting to upgrade SCCM 2012 to SP1. The RDC feature was installed on the Windows 2008 server
SCCMentor - Paul Winstanley 