A format is a rather hasty action for a driver problem...
Are you on Windows 9x or XP?

And yes, Dell should have them for download on their site, as most prefab pc companies do.
Have you messed with anything in your bIOS lately? That's all I can think of right now because I need to jet off to work in a min, but get back to me on these and I'll see what I can do / what else I can come up with.

Maybe tonight we'll fly so far away... We'll be lost before the dawn...