[Sudden WIFI Problems that did not happen before]

I am getting a message when tring to hook up to SL via wifi, saying that I have an internet connectivity problem, but I can hook up to the internet fine on any other program and I was not having this problem two days ago, it just manifested itself yesterday.  I first thought it was what appeared to be a program issue and I reinstalled SL, and I had a copy of Firestorm so I removed that program and reinstated it.  Still same issue arose.  My desk top all in one has no problem connecting to SL via wifi and  my Laptop is a high speed unit designed for internet gaming.  This problem has thrown me for a loop, and not sure which direction to go now