The vulnerability affects Enterprise and Ultimate versions of Vista in both 32 and 64 bit flavours of the operating system. XP is immune. Phion has published a workaround in the absence of a fix from Microsoft itself.It raises eyebrows when someone patches someone else's code. It's happened before, but not very often.
If it were me, I wouldn't use the patch. This seems to be a pretty hard bug to exploit. Certain classes of bugs, like Shatter, Blue Pill, and (maybe) this require pretty serious skills, and aren't easily scriptable. Net/net, you're unlikely to get attacked this way.