Due to data corrupt, icons in the notification area may become invisible,

Reset system tray icons, step by step:

1- Download CCleaner and install it:  www.piriform.com/ccleaner‎
2- open CCleaner, click Cleaner then check "Tray notification cache".

3- Click on “analyze button” then Run CCleaner.
4- Open the Taskbar: Alt+CTrl+Del.
5- End Explorer.exe process.



6- Click on file >> new task.



7-Type explorer.exe in the dialog box then click (OK) button.