WMI query in C# does not work on NON-English Machine

Question

I am creating an application that needs to track when a process starts, then raise an event when it's finished.

I have code that works perfectly, and does exactly what I need on an English machine, but when I run the same application on a French language machine it fails.

here's the code that fails

qstart = new WqlEventQuery("__InstanceCreationEvent",
            new TimeSpan(0, 0, 0, 0, 5),
            "TargetInstance isa \"Win32_Process\"");

qstop = new WqlEventQuery("__InstanceDeletionEvent",
            new TimeSpan(0, 0, 0, 0, 5),
            "TargetInstance isa \"Win32_Process\"");
        try
        {
            using (wstart = new ManagementEventWatcher(qstart))
            {
                wstart.EventArrived += new EventArrivedEventHandler(ProcessStarted);
                Log.DebugEntry("BeginProcess() - Starting wstart Event");
                wstart.Start();
            }
        }
        catch (Exception ex)
        {
            Log.DebugEntry("error on wstart: " + ex.Message);
        }

        using (wstop = new ManagementEventWatcher(qstop))
        {
            wstop.EventArrived += new EventArrivedEventHandler(ProcessStopped);
            Log.DebugEntry("BeginProcess() - Starting wstop Event");
            wstop.Start();
        }

the error hits when it tries to start the query: wstart.Start();

and does the same for wstop.Start();

I can only guess it has something to do with the language and the query string, but I'm clutching at straws.

The error it comes up with is: "demande non analysable"

Any help is gratefully recieved!

Martyn

Edit: Tested on 2 identical Machines, only difference being the language chosen on first startup.