gateway is the doorway into the router, modem, a server.
You'd do better to give your setup and if wifi or ethernet connection.
I just got a used netbook, it's not very old and it finds my wifi with no problem, but when I try to connect it it says "Gateway Error." I have called Frontier and they tell me not to bother them with WinXP problems and used computers especially. The lady I bought it from used her wifi all the time with no problem; I cannot find any information about gateway. Can you give me an idea of what to do? Thanks!