I came across the following error after restarting my System Center Cluster.
Run the following command to fix this:
mofcomp "C:\Program Files (x86)\Microsoft SQL Server\100\Shared\sqlmgmproviderxpsp2up.mof"
SQL Server Configuration Manager 2008 R2 – Cannot connect to WMI provider – Invalid class [0x80041010
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Ryan Mangan's IT Blog 
Very cool, however putting in this command exactly as you have it triggers mofcomp to give me it’s screen of how to use mofcompf properly! Is there a flag like -check or something we’re missing?
Found the problem, the file wasn’t mapped correctly. It ran to Done! but I still have the same error. We went through a domain change so it’s technically a different service account, and it’s been ConfigManager has returned that message ever since.
Your best bet would be reinstall SQL and restore the db’s from a backup.
Check out this link on tech net that provides additional guidance. http://social.msdn.microsoft.com/Forums/en-US/sqlsetupandupgrade/thread/7b6b422b-ba5f-45ad-a0b6-e9eed492fe8e/
Works for me, thanks a stack.