Hi ,
Have you tried the solutions on our launcher troubleshooting guide here?
#I_am_unable_to_install_the_Launcher_for_Windows
Additionally, are you able to open the editor by using the binary .exe file? Go to the filepath \Unreal Engine\ENGINEVERSION\Engine\Binaries\Win64\UE4Editor.exe and try to open it from there. Do you still have the same problem? Are you able to open the launcher at all or is it remaining completely unresponsive?