Here is a guide to easily install Chrome OS on a laptop PC even if it's too old to run Windows. You can run Chrome OS with Play Store support and Linux app support.

How to install Chrome OS Flex on Mac or PC First, we'll need to download the OS installation file and create a bootable USB drive. On your new laptop (other than the one you want to install Chrome ...

There's no reason you can't install (or dual-boot!) Chrome OS on a desktop PC, incidentally. To perform the Chromium OS install process, you'll need a 2GB USB memory stick.

Chrome OS Flex is a free operating system that's designed to run on and help revive old PCs and MacBooks.