Got an old Dell E520 here with a Prescott 3.06GHz P4 and 2 GB of RAM so thought I would try win 10 preview on it. The win 10 iso wouldn't proceed and came up with the old 5D error. This BIOS does have the NX option and it was set to on but the installer didn't want to know.
Anyway, found an item on YT that explained how to get around that installer check and it worked a treat. All you need is a boot option that allows you to see and execute a file on the ISO disc. Folder 'sources' has a setup.exe in it. Just run that. Easy.
I just threw an old 80GB HDD in and booted from a utility CD and away it went. This old Dell is running preview 10041 very well indeed.
(I happily use win 10 on my main comp but just thought I would try the above for a bit of distraction!).
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