I bought XP a long time ago and installed it on my old dell system fine. Today, I got my new system in and installed XP on it. No problems. It asks me to register and says I only have 30 days to register it. I don't remember but I'm assuming I registered XP when I installed it on my old Dell. Now my question is will I have a problem registering XP again for this computer? I guess my question boils down to whether or not I can install XP on multiple computers on my house using the same disc? Or do they make you buy a separate XP cd for each computer in the house?