I have an acer travelmate 370 laptop... it came preinstalled with windows xp professional (oem version). few days ago, i formatted my system and had to reinstall the OS (pirated one) coz i didnt get any cd with the lappy.. but i have that sticker pasted on the back of lappy (with serial no.) saying microsoft windows cp 1-2cpu acer incorporated.. this copy of windows is not activating(why would it!!!) i tried changin the key but the key which i have is not working... what should i do????