Before installing Windows 7, ensure your BIOS (UEFI) is updated. Older BIOS versions on the 800 G2 had bugs regarding legacy boot support that can make Windows 7 installation difficult. Update the BIOS to the latest version while still in Windows 10 or via the BIOS "Flash" utility inside the setup menu.
If you try to install a standard Windows 7 ISO, your keyboard and mouse will likely stop working the moment the installer boots. To fix this, you must "slipstream" or inject the USB 3.0 drivers into your installation media before you begin. Essential "Hot" Drivers for HP EliteDesk 800 G2 hp elitedesk 800 g2 drivers windows 7 64 bit hot
To avoid system hangs or errors, follow this specific installation order: Before installing Windows 7, ensure your BIOS (UEFI)
This guide covers everything you need to successfully deploy Windows 7 64-bit on your HP EliteDesk 800 G2. The Windows 7 Challenge on Skylake Hardware If you try to install a standard Windows
The 800 G2 typically uses the Intel I219-LM Ethernet controller.
This is usually the first driver you should install so you can download the rest of the updates directly on the machine. 4. USB 3.0 eXtensible Host Controller
The chipset driver is the "map" for your motherboard. Without it, other drivers may not install correctly.