kb63: Windows collections fail with "Invalid Class" error

Resolving "Invalid Class" errors is discussed in the FAQ Article How do I fix Collections failing with "Invalid Class" Errors?.

If you still get the "Invalid Class" error after following the steps in the FAQ, a reboot may correct the problem.

If a reboot does not correct the error, you may need to re-register the WMI components on the target computer, recompile the related MOF files, or rebuild the WMI repository. At the time of this writing, instructions for each of these procedures were available from Microsoft.