Nagios disk check for windows server using hard values and not percentages

You probably want to switch off host notifications, rather than host checks. Nagios only alerts on service failures if it thinks the host is up; if you switch off host checks then you will get a flood of service notifications when the host goes away.

To switch off host notifications, set notification_options to n like this:

define host {
    use                    generic-host
    host_name              example
    address                192.168.1.254
    notification_options   n
}

(assuming you have a definition of generic-host somewhere else)

Check retries has nothing to do with the interval notifications are sent. Use this parameter in your service definition:

notification_interval