I have been having a problem with connecting to a wireless network.  I have always been able to connect through my neighbors wireless network, but have been having troubles the past week.  It says I have a signal and that I am connected, but web pages will not boot up and when I try to go onto itunes, it says to check the connection.  I tried all last night to figure it out, and I am at my wit's end!!  I even tried to restore my computer to a date when I knew I was able to get on.  Please help!!