I can’t believe Microsoft’s stupidity on this one, and the support costs are really going to hurt them in the long run. According to their support site, there is no way to do a completely clean installation of a Vista upgrade. You have to put a copy of a previous operating system down first, then you can do a “clean” install (which wipes your hard drive anyway) from the Vista CD. Too bad if you’ve tossed your XP CDs out when you bought Vista. Too bad if you don’t want to waste the hour or two installing a system that is just going to be erased anyway.
This is pure marketing stupidity.
So, now I can only reinforce my original recommendations – don’t upgrade to Vista. It’s only worthwhile if you get it with a new PC.