This would be funny if it wasn't so serious
Ballmer famously claimed that "Vista is the most secure operating system ever." When I finished laughing, I took a look at the Microsoft vision of "security".
"Vista" is actually just a skinned version of XP with a bit of (very nasty) DRM thrown into the mix. The "security" model really just consists of nagging the hell out of the user with a series of irritating "nag" dialogues. The second time this happens, Joe user will switch off the "security" features. There are actually NO improvements to fundamental security as promised.
In fact, "Vista" is more open to abuse than XP.
On some hardware platforms, "Vista" is hideously unstable - it was rushed to market without even the most rudimentary set of drivers - so OEMs are ditching it and returning to XP (or Ubuntu!).
As ever, MS have entirely failed to deliver a working product. This adds to their long string of failures. In fact, if you think about it, MS have NEVER released ANYTHING that works properly!
Game Over, Microsoft!