1, click to open the Desktop Start menu, find a dozen run options open, in the pop-up Run text box, enter the "regedit" command, open the registry.
2, enter the Registry Editor interface to find "Hkey_local_machinesystemcurrentcontrolsetcontrolclass" item.
3, then the class item to find the "{4d36e96b-e325-11ce-bfc1-08002be10318}" item, click Open, found on the right "" value to delete it.
4, delete finished, we return to the desktop, right click on "Computer" select "Device Manager" option click Open.
5, enter the Device Manager to find the keyboard driver, right click on it uninstall, uninstall completed and then restart;
6, then open the registry to find the location we just add "UpperFilter" under "{4d36e96b-e325-11ce-bfc1-08002be10318}".
7, add complete, right click Select Edit option, change its value to "Kbdclass" click OK Problem resolution.