i have already face this problem.
the solution of this problem is that, first go to link which are given below.
copy this link and paste it to the web browser, then automatically downloading start.
and then install this downloaded driver into your pc/lappi and then install your audio driver .
also now if you have any problem then also paste the link into the web browser which are given below.
donload automattically start .
then install your audio driver.
it is sure that you will find that the problem is solve.........