microsoft have built vista with an automatic "report a problem"
it just states that your hardware is not working, even when it is, so that you are forced to go out and buy more hardware. They can then stitch you with the "you have upgraded too many times and need re purchase vista"
Ok I made that all up, bu tI for one woudl not be in the slightest bit surprised
and the same thing has happened on my cpu by the way, it started as a 5.2 now its down to a 5.0