The following error when installing the WindowsMonitor ZenPack seems to be the main problem to be overcome here.
Unable to find context path /zport/dmd/Devices/Server/Windows (line 4 ?) for WMI
This error means that the ZenPack can't create the /Server/Windows/WMI device class because the /Server/Windows device class doesn't already exist.
Can you confirm that you do have a /Server/Windows device class, and if not, create it and attempt to install the WindowsMonitor ZenPack again?