WMI performance query doesn't return correct data

		private void GetAspNetInfo(Dictionary<string, Dictionary<string, object>> res)
		{
			if (_counter == null)
				_counter = new PerformanceCounter("ASP.NET Apps v4.0.30319", "Requests Total", "__Total__");
			Console.WriteLine(">>>>>>>> {0}\t{1}", _counter.CategoryName + " " + _counter.CounterName, _counter.NextValue());

			if (_searcher2 == null)
				_searcher2 = new ManagementObjectSearcher("SELECT * FROM Win32_PerfFormattedData_ASPNET4030319_ASPNETAppsv4030319");
			Report(_searcher2);
		}

		private static void Report(ManagementObjectSearcher searcher)
		{
			DataLog.Info(string.Format("\r\n--------------------- {0} ---------------------\r\n", searcher.Query));
			foreach (var obj in searcher.Get())
			{
				var message = FormatMessage(obj);
				Console.WriteLine("\r\n{0}\r\n{1}\r\n", obj["Name"], message);
			}
		}

		private static string FormatMessage(ManagementBaseObject obj)
		{
			var properties =
				obj.Properties.Cast<PropertyData>().Where(val => val.Value != null && val.Value.Equals(0)).
				Select(val => string.Format("{0}={1}", val.Name, val.Value)).ToList();
			var message = string.Join(" ", properties);
			return message;
		}

The code above prints the correct result for data retrieved via PerformanceCounter, but the WMI query returns all zero values.

Any ideas why this can be happening?