hi afcisa,
Make sure the copy is clean, faceing in the right direction, that it is not just the upgrade to Windows XP sp2. That it doesn't have a computer manufacturers ’ name on it .
Follow the instructions for installing a VM when it requests the cd-dvd for Win xp insert follow all on screen prompts.
You may need to make an .iso copy of xp. (Sometimes this is necessary) I will see if I can find the instructions for doing this.
When I find the link I will post it for you.
kat