Service Stalker can be scheduled using the Windows Task Scheduler and can send an email notification when services are not running or are in the process of stopping or starting. This is a very simple but very powerful monitoring tool. In the FREE edition checks can only be run manually. All features are available in the full version.
Service Stalker currently monitors for: no services selected, services not running, services disabled, restart failed services. In the FREE edition checks can only be run manually.