This varies between different laptop brands, but it’s usually the Delete, F2, F8 or F12 key. To isolate the problem, as your laptop is booting up, repeatedly press the button that takes you to the BIOS screen. Is it a hardware issue (more serious) or a software one? The first thing you need to do is hone in on exactly what the problem with the keyboard is.
Remember: to reinstall a device, you just need to plug it in. In Device Manager again, click View, then “Show hidden devices.” Go down to keyboards, then right-click and uninstall everything called “HID Keyboard Device.” This is actually a bit of a catch-all term, as various other external devices – even mice – can be included here.