PS0 keyboard can not be used after upgrading win10

                                                                                                                                                                                         

After some desktops are upgraded to win10, PS/2 (that is, round port) keyboard can't be used. Some GHOST installed systems also have this problem, which can be solved by the following steps:

1. Connect USB keyboard ,mouse.

2. Press windows
+X or right click on the start icon in the lower left corner to select “Command Prompt (Administrator)”Open the Command Prompt window.

3. In the Command Prompt window, type reg add HKLM\\SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E96B-E325-11CE-BFC1-08002BE10318} /v UpperFilters /t reg_multi_sz /d kbdclass /f Enter the key, then restart the computer
PS/2 keyboard and mouse can be used normally.