Hello everyone!
Well, a couple of days ago I turned on my computer and opened up the "connect to a network" window. My usual wireless network, called Motorola, was there and I had three bars, so I clicked "connect".
It was taking forever, when finally a message popped up: "Connection unsuccessful- If you are connecting to a wireless hotspot, you might need to open a web browser to finish connecting"
This had never happened to me before, so I did what it said but it didn't work. The only thing that happened was that the network was still there, but it said "limited connectivity" and won't allow me to browse the internet. I can still open FireFox but none of the pages will load.
Other tech support sites have told me to unplug my router and modem, and all this other stuff that I don't understand. If anyone could help me out, I'd GREATLY appreciate it

I'm kinda technologically retarded, so if you could explain everything thoroughly it would help a lot.
Also, if it helps my computer is a Gateway-running on Windows Vista Home Premium. My parents got it for me back in 2007, and it hasn't given me a problem like this before. I'm now only able to connect using our AOL dial up connection, which sucks because it's SLOW.