If you are changing a hard drive, can you copy the windows XP from the old hard drive onto it. I just got a new hard drive to replace my old one. the old one is going into a different computer, dont worry i entend formatting it. The rest of the hardware in the current computer will remain the same, its just there is no phone line in the house. I can ring microsoft and register the windows but I dont want to be without the computer at the weekend.