Hi K. Prophett,
I tried to see directly from the Intel site for that motherboard Chipset, if i could find a Windows vista driver at least and i was unsuccessful at being able to do that. I only saw Winxp Drivers at highest on the Intel Site as well.
Have you tried to right click on one of those Exclamation mark items and select update driver or try using Windows update?? I know you said you searched for drivers on the dell website but i don't know if you have done this step yet.
Unfortunately i don't believe you can use another Chipset Driver from another Dell machine. The 2400 doesn't seem to be vista supported to chances are, that any boards even close to it will also not be vista supported (Due to the age of the motherboard). This however Does not Mean that when Windows 7 is released to retail that you wont be able to use it on your 2400. Windows7 is supposed to work with Allot Older hardware then any of their Previous OS's were able to do. Though no actual Upgrade Adviser utility has been released yet, so you can check your system. (Since they are still working on more supported drivers all the time while the beta goes on)
Other then that, i'm out of ideas. You could try posting on the offical beta forums in the hardware compatibility area and see if anyone else with a Dell 2400 has any ideas for you. Its located here http://social.techne...tegory/w7itpro/