This issue typically will not recur after the operating system has finished initializing all the background services before it is restarted. Make sure that you give the operating system sufficient time to finish these startup service initializations before you shut down or restart the computer. When you first start a new computer, the operating system typically runs startup service initializations that may take from one to six hours to finish, depending on which applications are preloaded on the computer. If you gave your computer enough time to finish the startup service initializations before you restarted it, and one or more of the system icons still do not appear in the notification area after the restart, you can make them reappear by deleting two subkeys from the registry. You can access these features by using Control Panel. However, the network, volume, and power features function correctly even though their associated icons do not appear in the notification area. You may also notice that the check boxes for the related system icons are not selected on the Notification Area tab of the Taskbar and Start Menu Properties dialog box.

When you start a computer that is running Windows Vista or Windows 7 for the first time, one or more of the following icons do not appear in the notification area in the lower-right corner of the screen. Windows Vista Business Windows Vista Enterprise Windows Vista Home Basic Windows Vista Home Premium Windows Vista Starter Windows Vista Ultimate Windows Vista Business 64-bit Edition Windows Vista Home Basic 64-bit Edition Windows Vista Enterprise 64-bit Edition Windows Vista Home Premium 64-bit Edition Windows Vista Ultimate 64-bit Edition Windows 7 Enterprise Windows 7 Home Basic Windows 7 Home Premium Windows 7 Professional Windows 7 Starter Windows 7 Ultimate More.

Windows 7 clock disappeared