Let's use a FreeDOS image for USB that contains a few tools (compiled & hosted by noahdfear).
The first two steps are carried out using a working computer.
Format a USB flashdrive as FAT32.
- If you are not sure how to tell or how to format it, please use the GUI version of a freeware called Fat32Formatter which makes it very easy.
- Save it to your hard drive.
- With the USB device (from step 1) attached, double-click NTBR_USB.exe to run it.
- Verify that the drive letter shown is the same as assigned by Windows.
Use Windows Explorer to check this. <<< Important!
- Then click OK.
Once the image is written to the device, you will be prompted to reboot ... but do not reboot.
- Instead, simply remove the USB device.
Connect the bootable USB device and start the ailing computer:
- Use the appropriate F key (often F12) to access the boot menu where you can choose to boot from USB.
- Press <ENTER> to boot to the USB device.
(Note: If F12 ... or any other F key ... is not an option, you may need to enter the BIOS Setup Menu and change the boot order.)
- After a warning screen there is a keyboard language options screen. Press <ENTER> to leave it at EN-US.
You should now be at the Tool options screen.
- Type 5 and press <ENTER> to choose the command prompt.
You will see an X:\> prompt, where X: is the ramdrive (temporary drive space in memory).
- At the command prompt type the following and press <ENTER> after each command:
Please make a note of any errors found or corrections made.
- When it completes type menu and press <ENTER> to return to the tools menu.
- Type 6 to select Quit, and press <ENTER>.
- Press <Ctrl+Alt+Del> to restart, and remove the USB device.
- Allow the computer to attempt booting normally and let me know the outcome.