Thanks for the information. Once I added that driver, I got a new message: "An error occurred with the boot selection. Verify media is present and try again."
So I followed these steps:
Enabled legacy mode in the BIOS.
Boot laptop and press F10.
Select [Advanced]
Select [Boot Options]
Scroll down to [SecureBoot Configuration]
Uncheck [SecureBoot]
Select [legacy] under Boot Mode
Save and exit.
Reboot, press [F12]
My PXE boot menu loaded, but once I selected my WinPE Menu item, it cycled back to the PXE boot menu after flashing mtftp on the screen .
I'm definitely missing something obvious here.