Because he doesn't need to. If Sony doesn't have Vista drivers for his laptop, then yes, Sony's support people should be contacted. Doing so now, would get the same response I just gave him. Go to the website and look for the drivers himself.
Does the Sony website have any Vista drivers for your webcam, and keyboard software that also runs under Vista? These should work in place of any 7 specific drivers and software.
At Sony Web site I can not find driver for webcam (Model VGN-CS16G) for WIndow Vista, Now do not support for WIndow7 at this website. So I have to find it out of sony website