We have three domain controllers that (in theory) are the same. However when we recently used WMI to access one of them to gather some stats it replied with "Class not registered" for the key "Win32_PerfFormattedData_PerfOS_System" The other two servers worked fine. Further investigation with CIMStudio (A WMI Class browser from MS) we noted that for this one domain controller many of the perf counters begining with Win32_PerfFormattedData are not present.Does anyone have any idea how to correct? We have rebooted and still have the same problem.

This tool may help.The WMI Diagnosis Utility -- Version 2.0http://www.microsoft.com/downloads/details.aspx?familyid=d7ba3cd6-18d1-4d05-b11e-4c64192ae97d&displaylang=enRegards, Dave Patrick .... Microsoft Certified Professional Microsoft MVP [Windows]