Google Chrome default browser problem

I made Google Chrome as my default browser in my laptop because I find Internet Explorer to be really slow.
It works fine for me but sometimes when I use some software, they wanted to connect to their website, and Internet Explorer still keeps popping up. I wonder why this is happening, but not all software in my computer, only about 4 or 5 of them.
Why Internet Explorer still keeps popping up even my default browser is Google Chrome?
