If you often have problems with the performance counters in your SharePoint in the log (example: “The Open Procedure for service” WmiApRpl “in DLL” C: Windowssystem32wbemwmiaprpl.dll “failed.) Performance data for this service will not be available Four bytes (DWORD) of the Data section contains the error code. “) and you use another monitoring tool, such as Paessler’s PRTG, it may be worthwhile
Workflows do not start anymore “Error at startup” The error is caused by improperly initialized Performance Counters based on Windows. A look in the log of SharePoint reveals the following error message:
Load Workflow Class: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.InvalidOperationException: The requested Performance Counter is not a custom counter, it has to be initialized as ReadOnly.