Check if a plugin is installed and enabled

Hi,
I’m trying to check if a plugin is installed and activated, but the plugin is never to be found.
Here is my code:

        Dim test As New System.Guid
        test = System.Guid.Parse("a756d85f-87cc-4187-a1ca-538ce64e1925")
        MsgBox(RhinoApp.GetPlugInObject(test) <> Nothing)

Any idea?

Maybe you can try Plugin.Exists,
It has out parameters for loaded and load protected.
http://4.rhino3d.com/5/rhinocommon/html/M_Rhino_PlugIns_PlugIn_PlugInExists.htm

Thanks this is what I needeed!