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