AutoCAD shows error, says write permission denied

I have installed Windows Vista and I wanted to use Google Earth Extension. So my question is, is Google Earth compatible with Vista? I am asking this because I was getting an error whenever I tried to load Google earth extension into AutoCAD Map. I need help in solving the error below.
Error image:

Image message :
Write permission denied. Unable to create CProgramFilesAutoCAD Map 3D 2010GoogleEarth.cui
