My old modem still works, so it's not my ISP or my cables. I switched cables to make sure. I tried using different Ethernet ports on my new modem. By new I mean given to me by a friend.
I was having trouble getting my ISP information to work so I factory reset my Belkin ADSL2+ Modem with Wireless G Router and then I was able to get it to talk to the internet. Problem is, it doesn't want to talk to my computer after about a minute and even when it says it's connected to the internet, Windows says "No internet access". After that switches to "No Network Access" I can't access the settings on it and have to turn it off and on again, but shortly after the reset it's back to "No Network Access."
When I troubleshoot the problem with Windows Network Diagnostics it tells me: "Local Area Connection" doesn't have a valid IP configuration. Also that: The default gateway is unavailable.