1 Copper

Upgrading OptiPlex 780 machines to Windows 10 from 7

I know that Dell does not support the upgrade of the OptiPlex 780 machines to Windows 10 but I work for a small non-profit and we are moving to online products that require Windows 10 and I have to make it work.  We have ten of these machines and was hoping that others have done this already and can tell me the pitfalls/fixes.... is there anything I should do first... Bio version? Chipset? etc. I have already upgrades a Latitude E6410 and there were a whole lot of steps to get it to work but there was a lot of info out there on Google to help.  Not so with the 780 machines.  I do know that I have to upgrade my version of Symantec.
My machines have Intel Core 2 Quad 2.66GHz Q9400 processors and 4 GB Ram with 150 GB capacity.

Any help would be appreciated!

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4 Replies

RE: Upgrading OptiPlex 780 machines to Windows 10 from 7


Thank you for writing to us!

The support is not provide for the Optiplex 780 machines to windows 10 is because of various reasons.

1- System configuration

2- Compatibility issues

Moreover its not tested so we really wouldn't be able to tell you the issues that it may incur.



DELL-Robin D
Social Media Support

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1 Copper

RE: Upgrading OptiPlex 780 machines to Windows 10 from 7

Robin, with the 10s of thousands of 780 out there I am sure that I am not the only group that HAS to make this work.  Are you telling me that there is no way to make it work no matter what efforts I go to? I am hoping for some guidance from someone that has been successful and it was suggested that this would be a good forum to ask.

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5 Iridium

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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1 Copper

RE: Upgrading OptiPlex 780 machines to Windows 10 from 7

Thank you for your help will try your suggested process!

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