Note that you usually do not need to kill gpg.exe and gpgsm.exe, as both are not daemons (long running processes). If you kill them, you may interrupt an action.
You may need to do it only if they hang.
Gpgconf is somewhere on windows, maybe you need to specify the path completely, (in this very moment I cannot check).
If you want to restart something a single time, you could use the taskmanager and the the right click menu or just reboot the machine. (Again there is no gpg or gpgsm process unless they are actively working on a command, long running are the gpg-agent, dirmngr, kleopatra and scdaemin. You can stop kleopatra from its menu.)