Roles/Features shows RPC error 0x800706BE

I posted this in another forum, and they suggested I try here:

This appears to be a problem with RPC. I have run the System Update
Readiness Tool, and here is the results:


=================================
Checking System Update Readiness.
Binary Version 6.1.7600.20593
Package Version 7.0
2010-04-19 00:19

Checking Windows Servicing Packages

Checking Package Manifests and Catalogs
(f) CBS MUM Corrupt 0x00000000
servicing\Packages\Package_for_KB978637_RTM~31bf38 56ad364e35~amd64~~6.1.1.1.mum
Expected file name
Microsoft-Windows-Foundation-Package~31bf3856ad364e35~amd64~~6.1.7600.16385.mum does not match the actual file name

Checking Package Watchlist

Checking Component Watchlist

Checking Packages

Checking Component Store

Summary:
Seconds executed: 599
Found 1 errors
CBS MUM Corrupt Total count: 1

Unavailable repair files:

servicing\packages\Package_for_KB978637_RTM~31bf38 56ad364e35~amd64~~6.1.1.1.mum

servicing\packages\Package_for_KB978637_RTM~31bf38 56ad364e35~amd64~~6.1.1.1.cat



I have tries manually downloading the KB978637 update, and installing, but
the update never finishes. I left it running overnight, and it was still on
the same screen:

Initializing installation... done!
Installing Update for Windows (KB978637) (update 1 of 1)...

and never finishes.

I need this fixed, because I need to add CGI so I can install PHP on IIS. I
haven't needed to be in the server management screen in a while, so I don't
know when this stopped working.

I am running Server 2008R2 x64 on a Intel Xeon E5405 with 16 GB of memory.
Server is less than 1 year old.

Thanks in advance for your help.