I'm going to sneak in to type the two KB numbers into this thread: KB2656351 and KB2600217
Now this thread can be found via search like all of the others in this forums that mention those same two problematic updates.
I've used a tool much like the one that Britton30 suggested and it has worked every time for those two KBs. That said, I would suggest uninstalling every update related to .NET 4 framework and every update related to .NET 4 extended (if you have those). Then install .NET 4.5
. Then install the updates that have come out for .NET 4.5
All of this may take you a few hours, but you will have a system with 10 to 30 fewer patches and a more stable version of .NET. I've done this for several computers and have not had any issues.