they will most likely have win98/2000 drivers if it's really old, but you have to hope winxp default drivers work fine, otherwise you'll be searching the net for custom drivers 😀
for example, on an old gateway laptop i have, i had to search for the sound drivers after i put xp on it. the gateway s upport site only had winxp/2000(and i think nt) drivers available. This is a year old laptop, so if it's within 3? *shrug* just have to go check out the site. only way you can find out for sure.