Oh, this is rich! So all you users out there that have been dealing with the pita that's Vista, don't feel bad; enough business customers have complained that M$ is now offered a "downgrade to XP" option for business users. Unfortunately it's only for Business and Ultimate users, but it's a start.
Link to article at Engadget
This is what happens when you shackle an OS too much and make it too different from what people are used to (another reason many people are hesitant to switch to Linux and so many people stick with Macs once they're use to them). Not saying it's a bad piece of software, but too many things either don't work properly or won't work at all. Give it a few more years.
Not sure how they could've done it better, perhaps some type of "jail" option for non-Vista compliant software so they don't wreak havoc upon the system; i.e., spam/virus/spy/[name your bad software here]-ware.