changing the BIOS to boot from "USB FDD",
It seems your BIOS will let you boot from a USB F
rive, but not a "USB Stick".
You could buy / borrow a 1.44MB USB floppy disk drive.
Then follow the instructions here
for how to make a floppy go on to boot a USB stick containing a linux distro.
The only other thing you could do is remove the HDD from your laptop, plug it into a USB HDD enclosure, install linux on it using a fully-functioning PC, then put it back in your laptop, and boot.
But maybe it is time you got yourself a new laptop?