In IE, goto Tools > Internet Options then click the Connection tab. Make sure the "Never dial a connection" option is selected, click Apply then OK.
Why? I don't know how you connect to the internet, but if you open Firefox then type in an address, (or click a bookmark), the option "Dial whenever a nettwork connection is not present", may kick in, and this may force IE to open up to do so.
Let us know if this works.
How can I stop IE from opening each time the internet session starts? It seems Firefox will open up but then IE opens over it. I have to doubleclick to close IE eash time. Any suggestions? Thanks.Firefox is my default browser.