No sound when i install XP sp3

Hello,

every body .i have install XP sp3 after that i have install my all drivers successfully.then i checked my sound its not working properly.i have drivers in backup.there is no problem in installation of sound card.but its not working properly.can any body tell me how to solve this problem.i have tried in many ways even i download new real tak HD software but its not working please let me know if there is any solution.