Dear Ameet,
Go in google, type free downloding software for p4 win xp, than enter , google will search for the all drivers, than select your sound driver brand and for win xp, again google will search for the same , for this operation you need to a email address, if already have than no problem otherwise open an acount in yahoo/rediffmail or any other which you prefer, after it all download your sound driver, ant install on your pc it will work properly.
amar