|Are you trying to create an XP install CD?|
There are no universal XP ISO files. Each version (Home, Media Center and Pro) require a different CD, and then there are retail and OEM versions that are determined by the license COA sticker. In order to service the systems I have a minimum of 4 disks to use. Then you add the custom versions of the different manufacturers such as Dell then even more.
What version XP are you trying to create? Did your system come with a recovery disk set?