There is no legal issue with using a Dell XP cd on a Dell that came with XP. Nor is there any issue with using an OEM XP or SP1 or SP2 or SP3 cd with your dell and using the COA Serial number on the dell that has the same version. AKA XP Pro to XP pro or XP home to XP home.   You can request a free set of backup disks directly from Dell by filling the form out located here: [URL]  
My daughter lost her xp cd that came with her dell Dim 3000 what I wanted to know is can I install my xp cd in her pc I am not using xp anymore I have vista installed on my dell Dim 8200. she wants to have her dell back to the way when she first bought it. but she cant find her xp cd to reinstall it.                                                                                                        Thanks                                                                                                       JIM
win. xp cd