Well I did try that, but if you have ever installed XP on a Vista machine it is not that easy.
I had to download the bespoke SCSI driver for the laptop and then transfer it to a floppy disk (remember them!), then XP installs a driver for a USB floppy drive to enable the SCSI driver to be installed.
After all that......it didn't work properly!
I am currently running a version of Vista Ultimate for which I have no licence key and have to reinstall every 30 days!! Don't mind in saying this as I do have a licence for Vista Business and so do not consider myself to be an illegal user - just frustrated!
I got so frustrated with Microsoft I got a Mac!