Can't uninstall Windows Media SDK once you upgrade to Vista

Back when this machine (my home Dell box) had XP on it, I had installed “Windows Media Format 9.5 SDK” for some little home projects I was working on.  Since then, I’ve finished up those projects and don’t need the SDK any more.  When I upgraded the machine from XP, it didn’t say there was a problem with the SDK being installed.

However, now that I’m trying to uninstall the SDK, the setup.exe refuses (even for uninstall) to run now – trying to click the Uninstall button with the above row highlighted gives:

Aw, pickles.  I guess I’m stuck with the SDK installed unless I feel like cleaning up after it manually and using msizap