code: def _uptime_windows():
      
      if hasattr(ctypes, 'windll') and hasattr(ctypes.windll, 'kernel32'):
          lib = ctypes.windll.kernel32
      else:
          try:
              # Windows CE uses the cdecl calling convention.
              lib = ctypes.CDLL('coredll.lib')
          except (AttributeError, OSError):
              return None
  
      if hasattr(lib, 'GetTickCount64'):
          # Vista/Server 2008 or later.
          lib.GetTickCount64.restype = ctypes.c_uint64
          return lib.GetTickCount64() / 1000.
      if hasattr(lib, 'GetTickCount'):
          # WinCE and Win2k or later; gives wrong answers after 49.7 days.
          lib.GetTickCount.restype = ctypes.c_uint32
          return lib.GetTickCount() / 1000.
      return None
docs: Returns uptime in seconds or None, on Windows. Warning: may return
      incorrect answers after 49.7 days on versions older than Vista.