Windows 64bit Version erkennen

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string _strOS="";
RegistryKey _rootKey = Registry.LocalMachine;
string _subKey = @"HARDWARE\DESCRIPTION\System\CentralProcessor\0";
RegistryKey _key = _rootKey.OpenSubKey(_subKey);
string _procName = (string)_key.GetValue("Identifier", "");

string[] _values = _procName.Split(new char[] { '' '' }, 2);
if (_values.Length >= 1)
{
  if (string.Compare(_values[0], "x86", true) == 0)
  {
    _strOS += "(32bit)";
  }
  else
  {
    _strOS += "(64bit)";
  }
}