These are the system tray icons in the Notifcation Area. Over time, the Customize Notification Icons list can become bloated with every icon that was ever displayed in the Notification Area. Some of these may have been uninstalled by now, but are still listed under the Past Items. This will show you how to reset this list to keep it clean and current.

1. Open the Start Menu.
2. In the white line (Start Search) area, type regedit and press Enter.
3. If prompted, click on Continue in the UAC prompt.
4. In regedit, go to: (See screenshot below)
   HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\TrayNotify


5. In the right pane, highlight both IconStreams and PastIconsStream.
6. Right click on these two and click on Delete. (IconStreams, and PastIconStreams)





7. Click on Yes for the conformation prompt.



8. Close regedit.
9. Close & restart explorer.exe in Task Manager. To restart go to Run and type in explorer.exe.