Modify the Internet Auto-Dial Settings

Start/Run/Regedit

“HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Internet Settings”
Value Name: EnableAutodial Data Type: REG_BINARY (Binary Value) Value Data: (00 00 00 00 = disabled, 01 00 00 00 = enabled).
Create a new binary value named "EnableAutodial", and set the new value to equal "01 00 00 00" to enable autodial or "00 00 00 00" to disable it.

Note:
This restriction can be used either on a user by user basis by adding it to HKEY_CURRENT_USER or on a computer wide basis by adding it to HKEY_LOCAL_MACHINE.