Apparantly, you have zero hardware devices in your PC apart from chipset and GPU... Typically there's also sound, networking, perhaps extra storage, maybe TV tuner, and so on.
For myself, there's on-board AC97 soundmax audio and 100Mbit ethernet on my mobo, but neither driver can be directly downloaded from the device manufacturers. I have to go through Dell.
Have you tried downloading updated drivers from Dell? It's not the easiest task in the world, unfortunately. Well, maybe they have updated their procedures, but in the past it certainly wasn't. Very disorganized system.
If windows update can step up and take a more prominent position here, all the better. It also streamlines driver install procedures, making it almost automatic.