If your computer has 2GB of RAM or less, the 32-bit version performs better as it uses less system memory.
Open Rufus, select your USB drive, and then "Select" to find your Windows 7 ISO. download link win 7 32bit iso
Before looking for a download link, it’s important to understand why you might need the 32-bit version specifically. While 64-bit is the modern standard, the is ideal for: If your computer has 2GB of RAM or
DirectX 9 graphics device with WDDM 1.0 or higher driver How to Create a Bootable USB Drive select your USB drive
CPUs produced before 2007 often do not support 64-bit architecture.