Windows Product Key
Windows 7 and Windows 8 keys still act as Windows 10 Keys and I recommend migrating to the latest build of Windows 10 Version 1809 (September 2018).
Windows 7 Product Key
Windows 7 Product Keys were physically printed on labels.
Windows 8 and 10 Product Keys
These Product Keys are embedded in the UEFI BIOS of Windows 10. Windows 10 Installation Media will automatically input them during installation and install the Correct Edition of Windows 10.
If your system cannot Boot into Windows, you should run diagnosis to determine whether or not your system has an issue due to Hardware Failure or due to Software Failure. You may also want to attempt Data Recovery before proceeding.
Slow Performance? – Upgrade your System Drive to a Solid State Drive
If you’ve came to these guides if you are running an Older Dell System and your Hard Drive (HDD) has failed or if your system has sluggish performance (100 % Disk Usage) then you should consider upgrading to a Solid State Drive (SSD). I recommend a Crucial SSD.
Windows 10 – Version 1809
Upgrading to Windows 10 Version 1809
These set of guides are for an Upgrade Install i.e. an upgrade from an earlier version of Windows 10 (or Windows 7 or Windows 8.x) to the latest version Windows 10 Version 1809. Follow these guides to Download Windows 10 Installation Media and Perform an Upgrade Install and then use your OEM Utilities to Update your OEM System Drivers.
Performing a Clean Installation of Windows 10
These set of guides are for an absolute Clean Install i.e. Securely Wiping your System and Starting Fresh. Follow these guides to Download Windows 10 Installation Media, Securely Wipe your SSD/HDD/HSSD and then Create a Bootable USB to Clean Install. After Clean Installation then use your OEM Utilities to Update your OEM System Drivers.
Windows 10 Older Version
Sometimes it is required to rollback to an Older Version of Windows 10 or to Clean Install an Older Version of Windows 10 in order to install a UEFI BIOS Update which may include fixes for your system when it comes to running the Latest Version of Windows 10.