To install this script put it where Blender has all its other scripts. userdata is a placeholder in this path here. I have german XP, and here it is called Anwendungsdaten.

... userdata\Blender Foundation\Blender\.blender\scripts

He already has reinstalled more than once from what i can read. Newest drivers are not always the best drivers. To be able to help you with MED it would good to know what exactly doesn't work with it. Doesn't load? loads but no display? Loads, but flickers? Loads,has display, but doesn't load mesh? What exactly is your problem?