Most modern laptops offer two options so you do not need to make your own copy, have a look at the documentation that came with the laptop, or talk to the company who sold you it.
The two options are:
A hidden recovery area on your hard disk. You should be able to restore Windows XP from that. Not all companies do this so check the documentation.
Or a recovery CD. Again, not all companies do this so check the documentation.
I bought a Dell PC recently and you had to pay 5 pounds extra to get the recovery CD. If you have not got a recovery CD then see if the company will sell you one.
(If they are reluctant, tell them you have bought a larger hard disk for the laptop and want to put Windows XP on that).