Download Windows 7 Disc Images (ISO Files)

If you are referring to the Product Key on the COA sticker affixed to your Dell laptop, that is an OEM Product Key.  Microsoft does not support OEM installations of Windows -- and does not provide ISO downloads when using an OEM Product Key.

Instead, go to https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-and-office-iso-download-tool   Download the tool and use it to download the ISO file that corresponds to the version of Windows for which you have an OEM Product Key. 

OEM Product Keys are only valid for the specific edition of Windows (e.g. Windows 7 Home Premium or Windows 7 Professional) AND the architecture (32-bit or 64-bit) shown on the COA sticker.

Microsoft does not supply Windows 7 ISO downloads for OEM preinstalled operating system Product Keys for Dell, HP, etc. machines

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This should assist you:

Here are the Key/s to press at Boot to start the Recovery Process back to Factory Settings (new condition), if your Dell has a recovery partition

Dell – Press F8 which will bring up Advanced Boot Options

How to restore a Windows 7 Factory Image on your Dell PC | Dell US

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Or you can use this for preinstalled or Retail Licenses

Download the correct ISO file and make your own disk and use the Product Key that is on the COA Sticker.

https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-iso-download-tool

And here are instructions on how to burn ISO images to disk:

http://www.snapfiles.com/get/ISORecorder.html

How to do a clean install:

http://www.sevenforums.com/tutorials/1649-clean-install-windows-7-a.html

The COA sticker is either on the underside of the Laptop or in the Battery Compartment.

With a Desktop it is either on the side, rear or top of the Computer Case.

Using the downloaded ISO file Method may require phone Activation.

If it does require phone Activation, do not follow the Auto Prompts, but hold on for a real person to explain to as to what has been done for re-installation purposes

"How to Activate Windows 7 by Phone"

http://www.sevenforums.com/tutorials/18715-activate-windows-7-phone.html

The above method also will require you to go to your Computer Manufacturer's website > Support and Downloads Section > locate your Model Number and Operating System > then download and install the latest Drivers for it.

Dell:

http://www.dell.com/support/drivers/us/en/19/ProductSelector

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Using the USB method in conjunction with the above Windows 7 download:

http://www.sevenforums.com/tutorials/2432-usb-windows-7-installation-key-drive-create.html

"How to Get and Use the Windows 7 USB/DVD Download Tool"

http://www.sevenforums.com/tutorials/31541-windows-7-usb-dvd-download-tool.html

Cheers

To get Windows recovery disk go to Dell support site. There you can download Dell OS Recovery Tool.

With that tool you can crate Win 7 recovery USB. Using that image you can restore your laptop back to original factory state.

To use that recovery tool you need Service tag number from the label at the bottom of your laptop.