Windows shows "Driver is unavailable" next to your printer, usually after a Windows update changed or removed the driver. The fix is to reinstall a current, compatible driver.
Work through these in order; most people are fixed by the first two or three.
Settings › Printers & scanners › remove the device. Then install the latest full driver for your model and Windows version.
Some manufacturers ship drivers via Windows Update — check for optional driver updates under Windows Update › Advanced options.
Win+R › printui /s /t2 › remove leftover packages for the model, reboot, then reinstall.
If a model-specific driver isn't available, add the printer with the manufacturer's Universal Print Driver or a built-in IPP/Mopria driver.
Browse step-by-step setup guides, error-code fixes and driver help for every major brand sold across the USA & Canada.