Funny, this can affect IE 6, but can't effect anything older than Vista. I find this odd, since IE 6 isn't even Vista-compatible (Vista comes with Internet Explorer 7, which can't be downgraded). The newest version of Windows that can run 6 is Windows Server 2003, which listed as being affected, but doesn't really count as "Vista and up", since it predates Vista.
Anyway, IE sucks regaurdless of security. IE 6 can't render many moder webpages, 7 and 8 suck up a lot more RAM and CPU than they need to (even when doing simple things, like opening blank new tabs), and all versions from 9 on are just likely in the same boat as 7/8 (I can't say for sure, since I stopped caring and switched to Firefox).