Please read the documentation chapter about the basic monitoring concepts.
It looks like you lack a basic understanding of what a host, a service, variables of a host/service and thresholds are.
What you showed in your config snippet will do nothing, if you don’t have a service check on that host, using the needed check command. Also disk_win_crit is the variable for the critical threshold in %, not the partition name.
(please you code style formatting with ``` in the future. See the FAQ thread for details)