Computer says limited access?

For about a year, my family has been using the E1000 cisco wireless router, and a while ago it stopped allowing us to connect to the internet wirelessly, and it would say "unidentified network limited access". at first it was only the computers in the house, but i could still connect to the internet using my ipod and xbox 360. so i was searching with my ipod a bunch of ways to fix the problem and then one of the solutions was to reset the router, which i did, but then i was unable to connect to the internet with the xbox or the ipod. Eventually we lost the ability to connect while wired, but that was fixed by restoring te computer to an earlier date. we brought the E2000 cisco modem today, but we still get the same errors, and we still can connect to the network. Any suggestions?