I dont have a real answer for you, as I am a python noob myself...
But, I get the same results when on my machine and I am running XP SP2.
I read somewhere about the os.sys.getwindowsversion() function.
I haven't tried it yet so I dunno anything about it.
Edit- I poked around on google for a while and came back mostly empty handed.
I did however, find this ....
http://python.about.com/od/pythonstandardlibrary/ss/os-module-1.htmMaybe you'll find it useful.
Oh wait...I just realized this post was from february 08....ignore me.
Is there a "New Post" button anywhere? So I dont keep necro-posting...lol