From Toshiba. I took a look at their site and don't see any hardware drivers
for XP/XP SP2 for that model. Didn't you check *before* you downgraded? If
this is a new computer and you want XP, restore the machine to factory
condition and then return it so you can buy another laptop that meets your
needs.
If you can no longer return the machine, it looks like you're stuck with
Vista. If you'd like help with Vista, post the problems with all pertinent
detail here.