Welcome to LQ!!
Do you have a wireless router supplied by Time-Warner? More generally, what is the make and model of the wireless access point?
The first thing to check is how the access point is setup. The typical IP for accessing the setup page is 192.168.1.1, but yours may be different. If you can't figure out what IP to use, the ISP will **definitely** know this much.
Once you get to the setup page, see if the wireless is setup for a fixed IP address or DHCP (dynamic addressing). For most home situations, you will want DHCP. Also on the setup page, you can assign the name and password for the wireless.
Next, be sure that the network setup on the computer matches the setup of the router.