Remove the conflicting Windows input filter
Update or uninstall the exact program isolated through Safe Mode or clean boot.
Maintain a working sign-in method and do not remove unrelated system input devices.
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Recover keyboard access and isolate Windows filter, remapping, and HID driver failures.
Reliable BIOS input proves the keyboard and basic USB path can work; failure only after Windows loads points toward its driver or software stack.
Open Accessibility on the sign-in screen and use the On-Screen Keyboard.
If the keyboard works there, isolate normal-mode filters and startup software.
Uninstall recent remapping or keyboard software before rebuilding the standard HID entry.
In Device Manager, uninstall only the affected keyboard device and restart so Windows redetects it.
Update or uninstall the exact program isolated through Safe Mode or clean boot.
Maintain a working sign-in method and do not remove unrelated system input devices.
Uninstall only the identified device entry, then restart.
Keep an alternate keyboard or On-Screen Keyboard available.
It bypasses most Windows drivers and startup software, narrowing the fault boundary.
Microsoft Support. Direct-port, battery, cable, hub-bypass, driver, and cross-PC diagnostic order.
Microsoft Support. Isolation of third-party services and startup programs.