I have to say the easiest way i like to do it is with a seperate dvd. I use a copy of nlite, make sure i have all the drivers fo rthe laptop or whatever i want to use (or set up driverpacks to run) set up the xp install to auto install with all the input parameters such as keyboard language cdkey etc, i can even integrate the specific drivers for the pc then if i want. I set up any software to install and run integrated there too and i can use nlite to auto delete all partitions, create 1 partition of maximum size and then have it set so if the owner inserts the disk they just have to press any key to start once the boot loader picks it up and install it. and i create that disk then use that disk to install on the pc so i know everything works and i can confidemtly say to the cust that if theres an issue just save any work they have and use the disk