This question is an exact duplicate of:
I have posted a similar question before. But the issue remains still. So it happens after I upload my system for galaxy S3 two week ago. And after that whenever I connect to my laptop , it wouldn't pop up the option to let me select MTP as before. And this is what displayed in control panel-> Hardware and Sound ->Devices and Printers http://i57.tinypic.com/slpft1.png
Does anyone know a possible solution to this?