i know it's an old tread but it might bu usefull for someone else, to do that you will need an other pc connected to te same network as your other old-PC, so on your PC wich you have windows install on ( i presume ) use Tftpd32 it's a dhcp and network booting daemon.
Set tftpd32 to have grldr as boot file.
Download plop boot manager
on the old-PC set it to a PXE-boot or network boot.
turn off dhcpd from your router of you're using it
Hi i have a older pc that connot boot from usb or cd, but can boot from a floppy. the problem is i dont have a floppy drive, and i need to install ubuntu. i was wondering how to boot from a flash drive without being able to do it from the bios. and maybe to boot from a cd if you know how to also. maybe externally. if its not possible could someone plz tell me alternative fix to my problem thx for the help