I have received this error message when I have tried to open the Aliases section of SQL Native Client Configuration on the SQL Server Configuration Manager. After to research during some time I have eliminated the error executing the following command from command line on my SQL 2005 Server :
mofcomp “C:\Program Files\Microsoft SQL Server\90\Shared\sqlmgmproviderxpsp2up.mof”
The output should be something similar to that:
This error appeared because during setup some .mof files (Managed Object Format) has not been installed or registered correctly. Mofcomp is a program responsible for registering and storing the data associated with .mof files (it should be on C:\Program Files\Microsoft SQL Server\90\Shared).
Angel Perez Palacios 