I don't even know if Dell provides a customized Windows 10 ISO anymore.  I think it's just system recovery images now.  They probably don't want to keep updating a customized ISO every 6 months when Microsoft releases a new version.  I actually prefer Microsoft's version simply because it's cleaner (despite the fact that more recent Windows 10 builds set up your Start menu as advertising space until you remove all of that **bleep**).  From there you should be able to just download Dell Update to get whatever drivers you need, or worst case download them manually from support.dell.com.

The Dell Windows 7 Pro Reinstallation ISO is better than the Microsoft one as it was updated in January 2016 opposed to 2011... and has additional hardware drivers for up to 6th generation Intel Hardware.

For Windows 10, the Microsoft Installations ISOs are superior as they are proper Windows 10 Installation Media opposed to "Recovery Drives" and hence gives more flexibility during installation. Moreover the Dell ISOs do not incorporate any additional drivers to the Microsoft ISOs.

yes, but where do I find it after I downloaded the iso file and chosen the save location.

it doesn't appear anywhere 

Welcome to the Dell Community  @adem28 

You can search for "Downloads" 

It should show the "File Folder"

Use the Dell OS Recovery Tool to create a USB recovery drive that you can use to reinstall the version of Windows or Linux that came with your PC:

https://www.dell.com/support/home/us/en/19/Drivers/OSISO/recoverytool

For a clean Windows 10 install:

You can make a W10 USB flash drive installer with the Microsoft Media Creation Tool, using an 8 GB flash drive using another Windows PC, if your PC is not working.

https://www.microsoft.com/en-us/software-download/windows10

If you are asked to enter a product key during the installation process, select the 'I don't have a product key' option, and W10 will install and automatically activate once you are connected to the internet.

Here are the steps to create the W10 USB flash drive installer...

Select Download tool now, and select Run.If you agree to the license terms, select Accept.

On the “What do you want to do?”  page. Select Create installation media for another PC, and then select Next.

Select the language, edition, and architecture (64-bit or 32-bit) for Windows 10. Select which media you want to use:

USB flash drive. Plug in a blank USB flash drive with at least 8GB of space. Any content on the flash drive will be deleted.

Then you can reinstall the drivers and available software from the PC's support page.

Best regards,

U2

Welcome to the Dell Community  @Amayzingone 

Windows 7 COA's are not held within the BIOS.

Only W8 and W10 COA's are electronically signed in the BIOS.

After installing W10 on a W7 system you must enter the COA that came with the W7 system.

If the W7 COA is not affixed to the system they can still be purchased on eBay. "Very cheap"

Regards,

U2

So the Dell Windows 7 product key that is held in the BIOS of Dell computers licensed for Windows 7 (Such as Optiplix 790 and 9010) will be used to activate Windows 10 on Dell Computer?

ALTERNATIVELY If one has a Dell Computer licensed, running and activated with Windows 7 then when using the MS Windows 10 installation media to upgrade to Windows 10 the Dell Computer (Optiplix 790 and 9010) will be automaticvally activated for Windows 10 without inserting a license key?

@saimmalik 

If you can read then follow the post above.

I have notified the Moderators about your advertising.

Good luck,

U2