Here is described part of windows boot process.

I would like to ask if there is a way to change boot folder, I mean to use something else instead of C:\WINDOWS.

And of course that something else is a copy of Windows directory.

It looks like bcdedit is good for that purpose but I'm not sure how to use that. That I want is to change path, which currently is \Windows\system32\winload.exe to \Windows Copy\system32\winload.exe

Another thing I have found out is registry, HKLM\BCD00000000\Objects\{df90fe29-c40d-11e2-a7bb-92410b6e649d}\Elements\12000002::Element value is \Windows\system32\winload.exe so changing this also may be promising.

But I'm not sure if I should change registry value and don't know how to use bcdedit, so any related help will be appreciated.