The best (if not the only) place to get those is the site of the manufacturer of your laptop. It's not clear what you mean with "not supported", since support for Dell laptops comes from Dell.
Kees
Hi All,
I am working in Aschere Energy Company in Dallas. For video calling to my clients I need Web Cam drivers for my laptop.
I found some drivers on dell.com but these are not supported. Please share the link where I can download web cam drivers.
Thanks!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic