After installing windows 10, windows start to download and install update . I see
Synaptics pointing Device driver version 19.0.9.5 conflicts with my laptop Toshiba Satellite L775D-S7226 . Problem is after updating (installing) some keyboards did not work such as keyboards 1,2,3,4 and spacebar.
So I enter control panel, choose Uninstall program and click Synaptics pointing Device driver to uninstall it. After that my keyboard get back to normal.