Because it's a pirated version of Windows?
Yes.
It doesn't "work the same" in order to "work the same" as the legitimate copy, it would have to "be the same" which means it wouldn't have the hacks to a number of core dll's in order to circumvent activation and what-not.
And without hacks to core dlls by self-proclaimed l33t haxxor's who's only redeeming quality is their ability to plagiarize perl scripts from the web your computer might not be as crashy.
OH! And even more important, it's in the forum rules, which you agreed to follow when you checked off that little box that said something along the lines of "I agree to abide by the forum rules".