linux lubuntu ISO & PLOP

[pierini1]

Hello,
this is me from italy.
I have got here a very old pc (FUJITSU SIEMENS SCENIC E600 i585) without option to boot from USB so i enabled USB boot by installing PLOP BOOT MANAGER through "windows InstallToBootMenu" and later also through "windows InstallToMBR" as shown here:
https://www.plop.at/en/bootmanager/plpbt.bin.html#runwin
https://www.plop.at/en/bootmanager/mbrinstall.html#wininst

Then i have put linux lubuntu ISO inside my USB bootable key by using RUFUS tool and i downloaded lubuntu iso (x86 version) from here:
http://lubuntu.net/

But when i boot my pc from USB (thanks to PLOP BOOT MANAGER) it goes to a blank black screen with a blinking cursor and I cannot do anything.

So how can i install my linux ISO from USB drive ?
Where is the error ?