its Easy to Reinstall Drivers , All you need is to have the original Disk.
The lay out i differnt on every driver disk so i cant tell you where exalty to look.
but the windows wizzard will have no problem finding them
just put the CD in your computer If it autoruns there may nice easy steps to follow , IE, click a button call'ed "install SoundCard/audio driver"
if there is great that will do all the work for you
or else use Device manager.
Go into Control Panel , then open System, click the "hardware" tab
and then the "Device Manager Button"
In the list youll need to find "Sound,bla bla bla"
under that you will find lots of things that dont make any sence, but your looking for the one that has the same name as on your sound card box or computer spec sheet.
then right click and update driver, it will send you trought the wizzard to install devices.
just go trought the Wizzard and follow the instrstions and you should be ok. if not come back for help ^.^