Ken has an old PC that he wants to boot Linux into. But he can't because he doesn't have secure boot on that machine. Leo says that at 12 years old, it wouldn't have secure boot built into it. So he'd have to have another option. Leo recommends downloading Rufus.ie, which will make a bootable USB key. Then install PopOS Linux using Rufus and run that from the USB on the old PC.
Larry is trying to boot up Linux from his USB key. Leo says that you can go to xtraPC.com and get one for about $36. It's got Linux on a bootable USB. It won't work on every computer, but will on those models that enable USB booting. You just have to change the boot order in your BIOS settings to check the USB drive. But you can make your own. Go to System76.com/pop and download PopOS ISO file. They also have instructions on how to create your bootable USB.
Mike is building a new machine, using a lot of his old PC parts, but upgrading the mother board. Unfortunately, he can't reinstall Windows because the computer can't read the product key. What gives? Leo says it should install, even if it doesn't activate. That will give him 30 days to activate it. He also may want to try Rufus, another free media creation tool that will create a Windows install. Mike likely has a faulty USB key that is causing installation to have issues.