Each computer has multiple ports for internet connections like Ethernet, dial-up and wireless to make it more suitable for different users which use different internet connections. Windows users, especially the ones which use laptops change the type of the connection frequently and sometimes that can get a little annoying when dial-up is brought up automatically by software like Firefox and Thunderbird. This little problem can be fixed in an easy way following these few steps. Click on the Start button located on the bottom left of your screen, you’ll see the Run section on the bottom which is used to open program, folder document or the website, in the dialog box type in inetcpl.cpl and press enter to access Internet Properties. If you find it easier you can also open up Internet Properties by going to Control Panel and Internet Options. You’ll see seven tabs displaying General, Security, Privacy, Content, Connections, Programs and Advanced- click on Connections tab which will display dial-up and virtual private network settings. Below it you’ll see three options- never dial a connection, dial whenever a network connection is not present and always dial my default connection. Basically all you need to do is to select never dial a connection, and the job is done. If dial-up window is displaying without use of software which require it, you might have a problem with spyware or something similar. In that case you need to download the software like Zone Alarm to stop the spyware from accessing internet, then use some of the anti spyware software to remove it completely from your computer. If the problem persists, then you might have some software which is basically trying to update itself, if that’s the case you need to check the setup of the software you might suspect and check for update settings. If you still can’t resolve your issue check out the Windows support.