PC Health Advisor will minimize to the system tray when not in use so that you can still quickly access all of its features. You can right click the system tray icon to open the program, or even directly start a scan; hovering your mouse over the icon will display a summary of your last scan results.
 

To disable minimizing to the system tray:
 

  1. Open PC Health Advisor and click on the Settings tab.
  2. Click General Settings.
  3. Remove the check mark next to "Display Exit options when clicking the Close 'x' button" and the entry below it "Minimize to the system tray instead of exiting".