ISP

I had Internet on my laptop before but I had too many things and a virus on my computer.  I reinstalled Windows XP on it and now I can't connect to the internet.  I thought there was a problem with it so I called DSL and they told me there was nothing wrong and they told me to go to control panel and network connections and click on ISP.  The ISP isn't there for some reason.  I have tried everything I can think of to fix it and I don't know why I don't have ISP on the computer.  Does anyone know what I can do? 

 

Thanks,

Megz