Disable Automatic Modem Connections at Startup

To Disable Automatic Modem Connections at Startup follow this step:

Start/Run/Regedit

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole.

Value Name: EnableRemoteConnect,
Data Type: REG_SZ (String Value),
Value Data: "Y" = enable automatic connections, "N" = disabled.
Create a new String value, or modify the existing value, called 'EnableRemoteConnect' and edit the value according to the settings below. 

Exit your registry, you may need to restart or log out of Windows for the change to take effect.