Return of Reckoning

I have this message when I launch RoR and try to connect:

Data.myp:
System.InvalidOperationException: Impossible de charger les données de nom de compteur, car un index non valide '' a été lu à partir du Registre.
à System.Diagnostics.PerformanceCounterLib.GetStringTable(Boolean isHelp)
à System.Diagnostics.PerformanceCounterLib.get_NameTable()
à System.Diagnostics.PerformanceCounterLib.get_CategoryTable()
à System.Diagnostics.PerformanceCounterLib.CounterExists(String category, String counter, Boolean& categoryExists)
à System.Diagnostics.PerformanceCounterLib.CounterExists(String machine, String category, String counter)
à System.Diagnostics.PerformanceCounter.InitializeImpl()
à System.Diagnostics.PerformanceCounter..ctor(String categoryName, String counterName, String instanceName, Boolean readOnly)
à System.Diagnostics.PerformanceCounter..ctor(String categoryName, String counterName, String instanceName)
à MYPHandler.MYPHandler..ctor(String filename, del_FileTableEventHandler eventHandler_FileTable, del_FileEventHandler eventHandler_Extraction, HashDictionary hashDic)
à RoRLauncher.Client.UpdateWarData()

Any idea or clue?