Hi,
There is couple of things you can do. Do try them.
First,
Attach the USB drive and restart your PC, and hit "Esc" button repeatly until it show boot menu. Choose to boot from the USB drive.
If it won't work, try this one :
1. Reboot.
2. Press F2 to enter Bios Setup Utility
3. Go to Boot Settings
4. Search something like Hard Drive Boot Order
5. Use the + or - key to move your USB drive to the top of the list
6. Press F10 to save and exit
Then follow the previous instructions and give me the file

This is really out from my expectation. I will try my best to help you

Perhaps it would be time consuming. I hope you can be patient.
Thanks!