im not gunna say its impossible, but valid points have been made that would cause this to be on helluva job coding it to work.
audio video and such, need to be emulated.
not to mention the xboxdash files ,,, well hell
the only way right now or in the near future unless your a friggin programming GOD, to make ANYTHING xbox run on your pc would be to use the Xbox XDK, which is not legal to have or own unless you got it thru legal means or are an xbox programmer,
im not saying it cant be done but with all the xbox coding guys here, your a noob and you want to try this, which is a cool thing, but your way in over your head my friend, and it sounds like you have little to no coding knowledge.
all xbox files are pripriatary code, you would have to do some serious emulating, cuz there isnt a way to run xbox code on a PC, unless ran thru the XDK.
that xbox dashboard skin for XP is sweet! i signed up for an account at Wincustomize. but of course the stupid confirmation email seems like its gunna take forever so i cant download the skin,, i wanna try it out, looks awesome.