There is a way around your problem. However before I start you must have a legal copy of the Windows OS software.
Ok there is a bit of software freely available which allowes you to exchange the software keys. You borrow your friends Win Xp disc and install it on your computer. When you have done this you run this software to exchnge the licence keys before you register with microsoft. This will put you on the right side of the law.
You will obviously need to get the relevent drivers from your laptop manufacturer to finish off the installation.
The software is called xp_key_exchanger
If you can't get hold of it give me a call.
Good luck