Cannot Connect to Internet?

This may seem very weird. I was downloading a movie last night and all of a sudden the internet does not work on any of my computers on the network. I can see the network but when I enter the password it does not work( I am possitive the password is correct because I added a new computer yesterday.) Something happened overnight, and it seems strange that it happened the day after adding this new computer, I checked it for any sort of viruses and there were none, its essentially a brand new computer (just reflashed the harddrive and installed windows 7, no its not a bootleg copy). Any suggestions before I just call Time Warner Cable?