Ok, but I guess MacDrive is already installed because windows can see her G drive. The problem is that in windows, the G drive is not displayed in My Computer and when she boots into Mac, it tells her that she cannot write to the drive, only read. She accesed the option "info data" (I don't know if that is in windows or Mac OS) and it told her that she can only read from the drive.
What is wrong with it? This happened all of a sudden, last night.