The Atom 455 processor has is; there's nothing visible in the BIOS to flip it one way or the other. The answer comes from Tom's hardware poster slashgeek:
Fire up an elevated command prompt by typing "cmd" in Start, right clicking on "Command Prompt" and selecting Run as Administrator. Type the following command in:
"bcdedit.exe /set {current} nx AlwaysOn"
Restart your computer, and try installing Windows 10 again.
That did the trick. Flashing a new BIOS (another exercise) didn't.
blood cost: none!
