Already did that, downloaded the w10 tool and made the bootable usb on the Gigabyte GA-P31-DS3L PC, doesnt work.You have to make the install media on a legacy BIOS machine. If you make it on a UEFI machine, the USB ends up with a GPT formatted partition which your BIOS can't read. Remember the BIOS is before any drivers, so even if your machine can read the stick fine in Windows, that doesn't help you to boot from it.
And the USB stick should be 16GB or 32GB as quite a number of old machines can't seem to boot from 64GB or larger.