import subprocess import ctypes class disable_file_system_redirection: _disable = ctypes.windll.kernel32.Wow64DisableWow64FsRedirection _revert = ctypes.windll.kernel32.Wow64RevertWow64FsRedirection def __enter__(self): self.old_value = ctypes.c_long() self.success = self._disable(ctypes.byref(self.old_value)) def __exit__(self, type, value, traceback): if self.success: self._revert(self.old_value) with disable_file_system_redirection(): process = subprocess.Popen(['tasklist'],stdout=subprocess.PIPE) stdout = process.communicate()[0] print 'STDOUT:' print stdout