sound card drivers can be Googled and downloaded.

Oh -what operating system are you using -- Win ? XP?

if so
go to -
my computer-right click then go to properties
then go to hardware
then device manager
then sound video & game controllers
find your sound card and click on it

then you'll get a whole section to check thru and in the drivers part try update driver.

You can also find it by going through the control panel , sound section.

hope this helps

Oh and your speakers are all connected & turned on /up?- mine came unplugged once