I experienced the same problem, but with all the DPF's, after installing IE7. Yet they all still work. Posted a q about this at the MS forums, the only answer received was to not worry about it.
Tried uninstalling 7 to use 6 again, problem didn't go away. Have no idea how to fix this issue, which appears to be the reporting of the status of these files, not the files themselves. Even tried deleting them then going to the appropriate websites to re install - a tedious business.
If you find a cure, I'm all eyes!