Need Your help ( Sound driver problem)

Need Help
I m reformat my computer. Everything is complete but
Computer not pick sound driver.
I have also driver cd (reltak ac97 ). But computer pick this driver and
One massage comes like
realtek ac' 97 audio
has not passed windows logo testing to verify its compatibility
with windows xp.
Still I m suffering of this problem
If u has any idea then plz tell me
Thanks