Hi,
This is a problem becoming more and more frequent with new hardware and dear old XP.
The best way is to put in a search string in Google or whatever. A probable example would be:-
LenTosh X123 (name of new PC and model number) drivers for XP.
Then see what comes up.
Hopefully you may find that Vista drivers may be compatible if no XP drivers exist.
Usually the PC manufacturer's site has a swag of drivers and you may be lucky.
Unfortunately XP (when first released) could not, "see the future" especially as regards PC hardware.
Sorry I cannot be more helpful.
Cheers,
Mark. (Aunty Jack).