If you want to know the status of the security tools and health of Windows 7, open WAC by clicking its icon or hover your mouse in WAC icon. The sample image at the left shows many important messages to attend and you should use WAC by attending to it before using Windows.
You can change the settings of Windows Action Center using these options:
You can disable which items that WAC should report but it's not recommended to disable any of these unless you won't forget or you are sure that the Task Scheduler in Windows is running fine and if a third party program is monitoring its status properly.
Windows Action Center runs as a service and it is depending on RPC and WMI services in Windows. If any of this service is not running, WAC will not work. Third-party programs can report its status to Windows Action Center.