Windows version is not consistent. http://en.wikipedia.org/wiki/Microsoft_Windows#Timeline_of_releases[^] win 98 SE ==> 4.10.2222 win 2000 ==> NT 5.0.2195 win XP ==> NT 5.1.2600 Vista ==> NT 6.0.6002 win 7 ==> NT 6.1.7600