As if you needed another reason not to use IE. Apparently it effects all versions of windows. Not sure if it was posted already, but I didn't find it. Anyways here are some links:
http://www.computerworld.com/s/article/9206999/Microsoft_warns_of_new_Windows_zero_day_bug?taxonomyId=17&pageNumber=1
http://blog.cooldotz.com/new-windows-vulnerability-zero-day-flaw-affects-all-windows-versions/
edit: added link
http://www.microsoft.com/technet/security/advisory/2501696.mspx