Disable Automatic Modem Connections at Startup

The system may try to initiate an Internet connection at Windows startup or at the start of 

many  applications. This setting can be disabled by a small registry hack. 

• Navigate to the key 
  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole.
• Create a new String value, or modify the existing value, called EnableRemoteConnect 
• E
  dit the value to “Yes” or “No” accordingly. Yes = enable automatic connections and No = 
  disabled.

NOTE :- Take the backup of your registry (by one of these Software's) before doing any tweak.