Here you go, show this to your friend.
http://www.bit-tech.net/news/2005/09/07/vista_hardware_reqs/
http://www.broadbandreports.com/shownews/67309
I have a Intel Celeron M Processor (my laptop), 1.30GHz with 512MB of RAM and a 64MB Video Card and already knew that VISTA doesn't need 16GB of RAM if thats even possible.