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:

1. Video Controller Driver Dell
2. Dell Laptops Latitude E6440

Dell Latitude E6440 Drivers Download This page contains the list of device drivers for Dell Latitude E6440. To download the proper driver, first choose your operating system, then find your device name and click the download button.

• Update Dell Latitude E6440 notebook drivers for free.
• Dell Latitude e6440 Drivers for Graphics Controller Driver Installation Tips. Dell Latitude E6440 has the latest Core i5 Processor. This laptop model by dell comes up with Intel HD Graphics 4600 Display. These graphics can only be enjoyed when you have a display card driver installed in your system.

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';

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

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

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!

Although Dell may take the position that by having installed a new version of Windows you've voided the warranty and therefore Dell has no obligation to help you, in fact there should be no difference with respect to installing a video driver between Windows Enterprise x64 and any other 64-bit version of Windows 7. What edition of Windows was pre-installed when you purchased the computers?

When you installed the new edition of Windows, you would have had to install all of the drivers, not just the driver for the video adapter. Did you do that?

Video Controller Driver Dell

When you say that you can't 'update' the video driver, do you mean that you already have a working video driver and want to update it or that you don't have any working video driver?

What happens when you attempt to install the appropriate video driver from Dell? Please report the complete text of any error messages.

Dell video driver for Intel video:

http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=YXJG1&fileId=3645824642&osCode=W764&productCode=latitude-e6440-laptop&languageCode=en&categoryId=VI

Dell Laptops Latitude E6440

Dell video driver for AMD video: http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=RY8K8&fileId=3502037215&osCode=W764&productCode=latitude-e6440-laptop&languageCode=en&categoryId=VI