Windows 7 > 10 on Skylake, BIOS/UEFI questions

[Threadlight]

Sorry for the confusing title. I couldn't think of another way to sum it up

So, I have a Asus Z170-M Plus with a Intel Core i5 6600k that is freshly built and with no OS

Asus provides a number of methods to install Windows 7 using modified iso's. I assume that I need to be in legacy mode to run Windows 7. After installing Windows 7 I plan to upgrade for free to Windows 10. If I do this, can I return back to UEFI in Windows 10 or am I short of luck?

(BTW I am installing Windows 7 because I am thrifty, plus I have a key lying around)

Thanks

 

[JQB45]

Windows 7 can be installed in UEFI Mode if you're installing a 64bit version of Windows 7.
http://blogs.technet.com/b/askcore/archive/2011/05/31/installing-windows-7-on-uefi-based-computer.aspx