Also the modems that you are seeing ;isted in device manager are/ should be Phone Modems. That is why you are seeing different numbers and types in your sister's and dad's computers than what you have in yours. Because each manufacture uses different phone modems for their computers.etc, etc, etc..
Now once you get online go back to internet options to the general tab and change the home page to your ISP or what ever you want. There are various ways to do this. Locate your ISP homepage URL and go there and search for "make this your home page" tab or something like that or in internet options change homepage to"about Blank" tab and type in the full url of the home page that you wish to be ...as http://www.whatever.com
then hit apply and that will set your home page to that address. let me know how you are doing