If you still want XP the best thing is to just run it in a virtual machine from within Vista, which you can pretty easily do and not have to throw your existing Vista install out the window. That also gives you additional backup options, and the ability to browse more securely inckuding discarding any changes since your last boot.
All that’ll do is give you XP that is as slow and clumsey as Vista.
If you have some instructions or links to them for running virtual XP, please let me know. Did you have any problems with drivers? I need to run an HP Laserjet Pro printer and I do enjoy YouTube and Google Vids as well as other internet videos. I think Adobe Flash Player is needed for those.
Thanks.