You could try using Registry Editor  HKEY
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Network\Persistent Connections
SaveConnections       set          no               , mine is set to        yes
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Or this by creating a New String for HKEY;

If remote connections are enabled in Windows, the system may try to initiate an Internet connection at Windows startup or at the start of many applications. This setting disables that behaviour.

 

Open your registry and find the key below.

 

Create a new String value, or modify the existing value called 'EnableRemoteConnect' using the settings below.

 

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

 

Settings:
System Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole]
Name: EnableRemoteConnect
Type: REG_SZ (String Value)
Value: "Y" = enable automatic connections, "N" = disable

 

 

Do you mean the 1st 2 boxes which ? HELP says for;
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"Enable autodial by Location":

"Lists the available locations where you can enable autodial. Autodial maps and maintains network addresses to connection destinations, which allows the destinations to be automatically dialed when referenced, whether from an application or from a command prompt. To enable autodial for a location, select the check box next to the location. To disable autodial for a connection, clear the check box next to the location.
The autodial feature works only when the Remote Access Auto Connection Manager service is started. To start the Remote Access Auto Connection Manager service, right-click My Computer, and then click Manage. In the console tree, double-click Services and Applications, and then click Services. In the details pane, right-click Remote Access Auto Connection Manager, and then click Start. In the Status column, Started appears."
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& for  check box;
"Always ask me before autodialling":

"Specifies whether to prompt you for permission before autodialing. If this check box is cleared, then you are not prompted and autodial is automatic."
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I have found when a Program requests a Remote Connection you get a "Network Connection POP-UP" not the usual "Dial-up Connection POP-UP".

 

So for reference did you also try the HKEY edits I suggested or only tick the first two boxes of "Advanced" > "Dial-up Preferences". ?