You are not market share Microsoft aiming for. But you are not obliged to use run Microsoft Windows either. Linux runs perfectly on old hardware.
42 MB RAM without graphical system
64 MB RAM with graphical system
You may run Windows applications on Wine. Or Windows 3.11 on virtual machine.
Netbook I bought in 2008 was underpowered for Windows XP but was perfect for Linux. I still have it around. With up to date Firefox and Chrome it feels slow but in console mode it's snappy.
No need for install with LiveUSB. Everything is here, countless people made it possible, would you use it?