I downloaded nLite to install XP on my friend's Dell XPS M1530 laptop. I only needed to add one driver (for the SATA thing). I do this in nLite, and it adds everything to the installation and finishes. Then I click next, however, and it takes me to the "Customization finished" screen. It skips right over the burn or make iso screen.

The first time I ran nLite it worked perfectly, but I can't use that dvd because I messed up which drivers to use. How can I get it working again? I tried reinstalling nLite with no results.

It sounds like you forgot to select the 'Create Bootable ISO' option on the Task Selection dialog. Other than that I can't think of anything which would cause it to skip like that.