The installer does not automatically copy grldr and menu.lst. You must manually copy them to the root directory of the target drive (e.g., C:\ or D:\). Without grldr, Grub4DOS will drop to a grub> command prompt.
When a PC fails to boot, GRUB4DOS can load from USB and access NTFS/FAT partitions to fix boot sectors or copy files – something many Linux-based tools struggle with out-of-the-box. grub4dos installer 1.1
Open Command Prompt as Administrator and navigate to the folder containing the installer. Run: The installer does not automatically copy grldr and
grub4dos_installer_v1.1.exe --install-mbr --disk=E: --force
Change E: to your target USB drive letter. When a PC fails to boot, GRUB4DOS can
Check the following boxes in the options menu to make the USB drive bootable on modern computers:
map --mem /mywinpe.img (hd0)
map --hook
rootnoverify (hd0)
chainloader +1
This loads mywinpe.img entirely into RAM before booting, making it immune to USB removal.
Click the "Save MBR" button. Save the file as original_mbr.bin to a safe location (another USB drive or cloud storage). This is your lifeline to restore Windows boot if something goes wrong.