The easiest way I have found to monitor Specific Windows Services across your Windows Hosts is as below.
Add a section in your main.mk file as below, each line listing the actual Windows Service that you are after (Eg DHCP Server: DHCPServer, pulled from Windows services.msc)
nano /etc/check_mk/main.mk inventory_services = [ 'WsusService', 'WINS', 'VMTools', 'Spooler', ]
You can check specific hosts for these services via the below inventory command
cmk -II --checks services [hostname]
Reload Check_mk to update your web UI with these new checks