Depending on the success with 1 and assuming you will not be able to boot info your installation of windows and or get your encrypted data out you will need to reinstall windows 10 which will destroy the data forever there are complex tools to try to retrieve it even from formatted disks but yours is also encrypted so if neither dell nor msft can help not sure if anything can be.
Factory reset dell laptop windows 10 from boot key.
Press the f11 or a key to enter into aomei recovery environment during system startup.
To boot from dell recovery repair usb drive when the dell logo appears tap f12 on the keyboard several times to enter the system setup screen.
Click the start menu and select the gear icon in the lower left to open up the settings window.
To factory reset windows 10 laptop from boot select reset your pc and you can select to keep my files remove everything or restore factory settings.
When the most recent restore point does not resolve the issue or fails select the next older restore point.
Here you can learn how to create recovery discs using your dell computer or how to download a dell factory image for your product.
To repair or restore your operating system to its original factory image visit the dell windows backup media and recovery options page.
Select your keyboard language.
At the choose an option screen select troubleshoot.
Please hold on the shift key until the choose an option window appears 2.
If you still can boot to the windows logon screen press and hold on the shift key click on the power button and select restart.
Restore windows 10 from boot using installation disk for achieving windows 10 system restore from boot with installation disk is another way to rest the pc in the factory reset mode.
The pc will start the dell recovery restore software on your usb drive.
To reset a computer to factory settings using the windows 10 original image use these steps.
When no restore point resolves the issues all of them fail or none are listed refer to the using the built in dell factory image restore partition tab in the windows 7 does not start correctly or at all section as other actions are needed.
You could do dell factory reset with the system image file in windows 10 8 1 8 7 vista xp and windows server systems the steps are.
Under settings click update security to.
If you use this option on a branded computer you may lose the ability to use the custom.
On windows 10 8 1 8 laptop desktop pc if the system can t boot normally it will boot to the winre mode automatically.
At the boot menu select the device under uefi boot that matches your media type usb or dvd.
At the dell logo screen tap the f12 key several times until you see preparing one time boot menu in the top right corner of the screen.