4.5.1 with Vista SP2

I installed .NET 4.5.1 on my Vista SP2 platform.  The installation works fine and announces that 4.5.1 has installed.  When I'm done however and run clrver.exe to check the active .NET platforms, this is what I see:

C:\Program Files\Microsoft Visual Studio 10.0\VC>clrver
Versions installed on the machine:
v1.1.4322
v2.0.50727
v4.0.30319

Also, when I try running a program that requires 4.5.1 it fails.  What gives?

Thanks.

PS.  Please feel free to point me at the appropriate forum as need be.

jbmckim