If the Network Connection icons are
missing, try the following to get them back:
NOTE Despite this issue, networking continues to function correctly, and the ipconfig command still shows all connection and all adapter information. However, dial-up users may not be able to initiate a connection due to missing icons.
You can still connect to (or disconnect from) the ISP using the RAS Phonebook. Follow these steps:
Click Start, Run and type:
C:\Documents and Settings\All Users\Application Data\Microsoft\Network\Connections\Pbk
Double-click the file named RASPHONE.PBK (Shows up as RASPHONE) and connect to the internet.
Click Start, Run and type
Run the following commands one-by-one and press Enter after each command:
If this does not help, try the steps
listed in the Microsoft article:
[How to troubleshoot missing network connections icons in Windows Server 2003 and in Windows XP]