By default, ESET security product notifies you when there are updates available for your operating system. You can modify or disable these notifications.
Follow the steps described below to disable OS update notification:
1. Open ESET Node32 antivirus or ESET Smart security.
2. Press F5 key to open advanced setup.
3. From the Advanced Setup click Tools - System updates
4. From the drop-down menu select your preferred notification setting (e.g. no update) and click OK to save the settings.
To get back the Maximum Protection status (green icon), click Protection status from the main menu and then click ‘here’ in the Operating system is not up to date message. Click Run system update and then either update your OS or close the window. (Via)