Recently, a friend's computer brain suddenly appeared as long as a press on the keyboard will not respond, but the computer other programs are still running, but the keyboard and mouse without any reaction. And after restarting the keyboard, the mouse can do any action. The problem was not resolved after using the 360 system fix. View Device Manager and find the keyboard driver showing a yellow exclamation mark! Later reload the driver, showing "driver does not exist, error code 39", after uninstall or still. Then finally found the solution on the Internet, for everyone attached.
Keyboard driver appears yellow exclamation point resolution:
The problem may be caused by a registry error when the virtual machine is deleted, and the workaround modifies the registry:
Open registry regedit:
Found: hkey_local_machine\system\currentcontrolset\control\class\{4d36e96b-e325-11ce-bfc1-08002be10318}
Delete UpperFilters Items
Uninstall the device and reboot.
The installation driver will prompt for error code 10 and the device cannot start.
Then modify the registry: hkey_local_machine\system\currentcontrolset\control\class\{4d36e96b-e325-11ce-bfc1-08002be10318}
Add a string UpperFilters entry with the content Kbdclass
Uninstall the device and reboot.
The problem is resolved after restarting.
From for notes (Wiz)
Invalid keyboard driver after deleting, uninstalling virtual machine, yellow exclamation mark
