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RE: Upgrading OptiPlex 780 machines to Windows 10 from 7

The OptiPlex 780 was released in Late 2009. Most would have been sold in 2009-2011 and with 4 years warranty standard, pretty much all units have expired warranty. Dell therefore are extremely unlikely to allocate resources to testing this model.

However the OptiPlex 780 is a robust Intel machine. Pretty much all the system drivers will be inbuilt into Windows 10 TH2 for it.

Make sure all systems are on Legacy BIOS revision A15:

This system doesn't have UEFI and SecureBoot.

Then made a Dell Backup and Recovery 16 GB USB flash Drive (using the latest version):

Then you can proceed with the clean install (recommended) or upgrade install (not recommended):

When making a Bootable USB use the MBR partition scheme for legacy BIOS.

Some additional tutorial videos are here:

Others have reported successful installs:

Dr Philip Yip
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide

Windows FAQs and OEM Downloads

#IDoNotWorkFor Dell
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