If you mean the sound card drivers or audio drivers for your Dell Laptop/Desktop you can find it at: http://support.dell.com/
On this website you will need to enter your service tag and then it will suggest you the drivers for your Computer according to the Operating Systems.
Drivers from our support website are compatible with all versions of windows 7 including Windows 7 Ultimate. However, we recommend these drivers for our computers purchased with windows 7.
If you need any other help please feel free to send your service tag to me in a direct message.
Certified Dell Community Professional
You can reach us at https://twitter.com/#!/dellcares