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 7 Pro 64 Bit can only run on systems with a 6th Generation Intel Processor or Earlier. The newest Dell Systems to run Windows 7 Pro 64 Bit are the OptiPlex 7040 and OptiPlex 3040. You can no longer get these on the Dell Website as they have been superseded by the OptiPlex 7050 and OptiPlex 3050 respectively but you can find plenty on Amazon (I’ll give affiliate US and UK links below, if you use these, it will help me cover the costs of running this website).
A Clean Install of Windows 7
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 7 Installation Media, Securely Wipe your SSD/HDD/HSSD and then Create a Bootable USB with Necessary Driver Support to Clean Install. After Clean Installation it instructs in Driver Installation Order.
Virtualisation of Windows 7
It is sometimes more convenient to install Legacy Versions of Windows in a Virtual Environment. This will instruct you in creating a New Virtual Machine to Install Windows 7 Pro on using a modern Host PC with a Windows 10 Pro OEM License. Alternatively it will instruct you in converting the Windows Installation of a Physical Machine into a Virtual Machine.