Watch the BIOS while you boot up (you may have to hit esc or spacebar or a function key to get rid of a splash screen). It might give you some detail about what card you have. Then you can go straight to the manufacturer's site. Don't what else to tell you if you've tried all of the options on the Dell site.
On a side note, one of the major projects I work on is with Dell. I get emails with titles like "Dell Drivers" all the time. Kinda freaked me out to see that on the board.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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