Linux: Plug keyboard in. It just works™.
Windows: Plug keyboard in. Wait five minutes while it checks Windows Update for a driver, and wait for it to install that driver. Unless your keyboard is extremely basic, this will fail, so now you have to find another keyboard or use the on screen keyboard to find a driver.
For some reason one PC everytime I unplug it for a long time and the plug it again and adjust the clock correctly (CMOS battery is wasted I think), Windows FORGETS the USB drivers even if it's in the same port. So I have to restart the PC to plug a shitty PS/2 mouse.
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