Win7 notebook keyboard failure is also useless how to solve?

Recently, there is feedback from users of Win7 system. His Win7 notebook keyboard is out of order. After uninstalling the device driver, the restart cannot be solved. It is useless to connect an external keyboard. The user opens the device manager keyboard and finds a yellow exclamation mark. This may be caused by the user deleting some files, or some of the optimization software is not standardized, and the keyboard driver has been tampered with. For this situation, the following small series teaches everyone a solution.

Procedure:

1, Start, Run (or WIN + R) to open and enter run regedit determined;

2, the Registry Editor Positioned under: HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E96B-E325-11CE-BFC1-08002BE10318};

3, delete the UpperFilters item, uninstall the device, restart;

4, after restarting or useless we found that the device manager becomes: Code 10: The device can not be started;

NHI_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E96B-E325-11CE- BFC1-08002BE10318};

Add the string UpperFilters, the content is kbdclass, uninstall the device, restart;

If this method can not be solved, please backup the data and reinstall Win7 system .

The above is the Win7 notebook keyboard failure is also useless solution, more questions about the keyboard does not respond, we can refer to: Win7 system boot does not detect how to solve the keyboard.