I have KB974417 prompting for install via AU, but fails to install.
If I download and run the installer manually, I get the error "None of the products that are addressed by this software update are installed on this computer. Click Cancel to exit setup."
Edit: Updates are delivered via WSUS to this machine.
I know I have .NET v2 SP2, v3 SP2 and v3.5 SP1 installed.