Compaq laptop - vista to xp - drivers problem

i had to downgrade back from vista to xp because some applications that i need to use still not available for vista, now as i installed xp, my sound and vga cards are not working, i went to compaq website and found out that laptops will not work properly if downgrading from vista to xp and the only way to solve it is try to use other drivers from other companies,

can anyone advice me of any good resources for drivers for compaq laptops? or maybe there are any others solutions?