Windows 8.1 works in the P4 old computers

Windows 8 development started before Windows 7 had shipped in 2009. At the Consumer Electronics Show in January 2011, it was announced that the next version of Windows would add support for ARM system-on-chips alongside the existing x86 processors produced by vendors, especially AMD and Intel.

How To Use UltraISO Software To Create Bootable USB Flash Drive

UltraISO is an application for Microsoft Windows for creating, modifying and converting ISO image files used for optical disc authoring.

Initially UltraISO was shareware however since 2006 it has turned 'Premium' and become chargeable. The 'Free Trial' version is limited to ISO images of 300Mb or less