It's not DOS as It's UEFI so You have Boot into UEFI mode !
I posted a link to explain !
To Create a Bootable UEFI USB Flash Drive using Free Program "Rufus"
1. Download the latest version of Rufus at the link below, and save it's .exe file to your desktop.
Note : This is a standalone exe file that doesn't install anything to your PC.
For Rufus FAQs, see:
https://github.com/pbatard/rufus...
Rufus - Create bootable USB drives the easy way
2. Connect your USB flash drive if you have not already.
3. Run the rufus_v###.exe file, and click/tap on Yes if prompted by UAC.
NOTE: ### = latest version number.
4. Set Rufus with the settings below: (see screenshot below step 5)
Under Device, select the USB flash drive you want to format and use.
Under Format Options, check Create a bootable disk using, click/tap on the browse icon Name:
icon.jpg Views: 925422 Size: 1.2 KB to navigate to and select your 64-bit Windows 7 or Windows 8 or Windows 8.1 ISO file.
So as You can understand RUFUS needs an ISO of your Win7 / Win8 to grab the EFI Boot module !
Under Partition scheme and target system type, select GPT partition scheme for UEFI computer.
Under File system, select FAT32.
Under Cluster size, select the (Default) (ex: 16 kilobytes or 4096 bytes) it has listed.
Under Format Options, check Quick format.
Under Format Options, check Create extended label and icon files.
Under New volume label, you can enter any name you like for the USB flash drive, or leave the default name.
When You got theis USB Stick Booting UEFI then copy the "modified" folder's files into and
Boot in UEFI mode from the USB and execute that command
fpt.efi -f bios.bin -bios
Regards