XP or Win 2K ????

[Gowjo]

My friend copied a dvd for me it worked fine using clone dvd, and it works on my dvd player, he uses win XP, i made a copy of it in nero ...... i use win 2k..... it wont work on my dvd player, but it works on my neighbours number 2.. it didnt work on my neighbour numer 1, my neighbour number 1 took 1 of my blank dvd;s using win xp he made a copy, it works on mine.. but my copies wont work on his machine... to summerize.
my copies wont run on my dvd player, or my neighbour Number 1,s dvd player, done in Win 2K
my copied dvd's will run on neighbour number 2's dvd player.
neighbour number 1 did a copy of a movie using one of my blank dvd's in win XP, it works fine........
should i upgrade to win XP ????? not if i can help it.. hope u can help