Dell E6400 Windows 7. Perfectly correct with the remark about sarcasm. Though an easier solution I have found is to get the Ethernet/wireless drivers on and then right click the device with missing driver in Computer Management and Update Driver and I am sure Windows will find one. This Lenovo driver worked for me. Windows 10, Dell E6400 Notebook, Dell 370 Wireless BT card. Dell 370 Bluetooth drivers for Windows 10 Jump to solution.

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first choose your operating system, then find your device name and click the download button. We hope with our information can help you. And may your computer, Laptop.
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HA! I figured it out (for the Latitude e6410)! Download the Intel graphics drivers from Dell, extract it with 7zip or something, edit the file Graphicsboa64.inf:

find the section [Manufacturer] and change the following:

%Intel% = IntelGfx, NTamd64.5.1, NTamd64.6.0, NTamd64.6.2
[IntelGfx.NTamd64.5.1]
; no install on XP
[IntelGfx.NTamd64.6.2]
; no install on Win8
[IntelGfx.NTamd64.6.0]

to:

%Intel% = IntelGfx, NTamd64

[IntelGfx.NTamd64]

Go to Settings, Update & Security, Recovery, click 'Restart Now' under Advanced startup;

Choose Troubleshoot, Advanced Options, Startup Settings, click 'Restart';

Hit '7' (or whatever number says 'Disable driver signature enforcement';

Go to Device Manager (can be found in Control Panel), Expand 'Display adapters' and right click on 'Intel(R) HD Graphics' (or whatever it's calling your video card), and click 'Update Driver Software';

Click 'Browse my computer for driver software', click 'Let me pick from a list of drivers on my computer';

Dell Latitude E6400 Windows 10

Click 'Have Disk' and browse to (where ever you extracted the drivers from Dell)Graphics ;

Dell E6400 Controller Driver Windows 10 64

Pick Intel(R) HD Graphics and click 'Next'

Dell E6400 Controller Driver Windows 10 Download

This should install the drivers and make your laptop display work. You may have to disable automatic driver updates if you have trouble in the future. You can find instructions on how to do that by 'Google-ing' it.

Hope you find this helpful, as it took me a long time to figure it out. Thanks to all others troubleshooting this, as I would not have figured it out on my own!