Start by going to the Dell Support website @ http://support.dell.com/support/index.aspx?~ck=pn
Dell also has forums for their products @ http://en.community.dell.com/
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”
That's a slightly unusual request. The drivers included with Windows 7 (are you running Windows 7?) are usually sufficient, although the ones that come in a chipset driver package may be more hardware specific.
I'd look for the chipset drivers at support.dell.com, as Rick Dee posted. As you've told us nothing about your PC other than it's a Dell, it's not possible to look up a link for you.
It is better to visit DELL Support website to download the drivers according to your computer model.
For your reference: http://www.dell.com/
Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
TechNet Community Support