VirtualBox was throwing an error with certain guests like Win10-64Bit:


AMD-V is not available (VERR_SVM_NO_SVM).

Fehlercode:
E_FAIL (0x80004005)
Komponente:
ConsoleWrap
Interface:
IConsole {872da645-4a9b-1727-bee2-5585105b9eed}




Win10 can't turn Hyper-V off error 0x80070005
so workaround:

copy boot entry:
bcdedit /copy {current} /d "No Hyper-V"


don't start Hyper-V as hypervisor
bcdedit /set {insert GUID from output above} HypervisorLaunchtype off



Now I got to the next stage where I was trying to use a copy from a bootable USB stick that I put into an ISO file with IMGburn:


1. Click on the "Create image file from files / folders"
2. Now in the "Sources" browse to your USB stick
3. in the "Destination" choose where to save the final ISO image
4. Now go right in the "Advanced" tab and then "Bootable Disk"
5. Check the box "Make Bootable Image" and then, in the "Boot image" box browse to file "etfsboot.com" that is in your bootable stick found in the folder "boot"
6. In the field "Developer ID" put "Microsoft Corporation" and enter "07C0" in the "Load Segment" field
7. Enter '4' in the 'Sectors To Load' field if your etfsboot.com file is 2K is size, enter '8' if it's 4K. (Basically it's the size of the file in bytes divided by 512 - i.e. 2048 / 512 = 4)
Note: Vista's is normally 2KB and Windows 7's is 4KB... so enter '4' if you're building a Vista OS installation disc and '8' if you're building a Windows 7 OS installation disc.

https://forums.hak5.org/index.php?/topic/15567-convert-bootable-usb-to-iso/

With Win10 64Bit:
Now the "Windows Boot Manager" tells me that:
\windows\system32\boot\winload.exe
0xc000035a


With Win10 32Bit:
0xc0000260
The processor is not supporting PAE(Physical Address Extension) for systems with more than 4GiB total memory (=RAM + VRAM).