stupid internet

Tell me why will the internet work on the first floor of the house but not on the third. I am currently sitting in the sitting room (not one of myrooms) with my computer until the battery dies or Susanne gets home. Why? Because I need the internet for all of my daily tasks since rosetta stone no longer works on my computer the internet is all I have to do and to learn from. But now it is dead... WHY WORLD WHY?