You will always want to have your sound drivers operate properly and give you quality performance everyday.
In some cases you may not get the installation CD.
Then, in such a situation you will have to obtain the drivers yourself.
You can refer to the manufactures website and download the appropriate sound drivers.
Then, while downloading try to download drivers from trusted websites,
otherwise malware or viruses will be downloaded along with your driver and it will corrupt your operating system and affect your sound card.
Get more information to fix HP Laptop Sound Drivers Problem :http://supportforhp.iyogi.com/laptop-sound-drivers.html
Hope this helps you.