i bought a acer laptop in china but the windows was in chinese.I have a valid cd key for windows xp home edition at the back of my computer but i cant use it.I got a english home edition cd and tried to change the serial number to mine but it gives error meeage that the cd key is mistyped ,what can i do to solve this problem i am liable of getting a genuine copy of home edition but i am not able to use it i tried to activate it but i even cant update as it says mistyped but i have the serail number with me which is yet to be resistered in microsoft......please can any one help me out of this?