We recently experienced an installation of Windows 10 with system files that were totally corrupt. After attempting typical repair options, we used a Windows 10 ISO to perform an in-place upgrade, reinstalling Windows 10 while preserving even the software you have installed.
Repairing a faulty gadget no longer requires a PhD in electrical engineering with sites like iFixit providing tutorials that empower people to repair things on their own. After all, if your device is no longer under warranty and the only option is to buy a replacement, what's the harm in trying? Complexity, that's what.