handle the exception when starting ProcessMonitor(ManagementEventWatcher).

src/AddIns/Debugger/Debugger.AddIn/Service/WindowsDebugger.cs

@@ -157,12 +157,17 @@ namespace ICSharpCode.SharpDevelop.Services
 					if (index > -1){
 						Attach(processes[index]);
 					} else {
+						try {
 							this.monitor = new ProcessMonitor(processName);
 							this.monitor.ProcessCreated += delegate {
 								WorkbenchSingleton.SafeThreadCall((Action)(() => OnProcessCreated(defaultAppProcess, options)));
 							};
 							this.monitor.Start();
 						}
+						catch (System.Exception ex) {
+							LoggingService.ErrorFormatted("Process Monitor exception: {0}", ex.Message);
+						}
+					}
 					
 					if (options.Data.WebServer == WebServer.IISExpress) {
 						// start IIS express and attach to it