Trying to update to 5.0.1 via kies it gives the message on attached image.I unplug the device and it says installing device drivers after it finishes it still brings back the same message
Have you tried to just connect your phone to the computer and see if the drivers download automatically? I was thinking mine would do that.
Kies is so finicky that I never use it anymore. The one thing many have done has been to get on live chat with Samsung support and many of them can walk you through getting the issue taken care of.