A user is experiencing internet connectivity issues with one of two computers connected to the same modem via an extension cord. The modem is identified as a Speedtouch DSL device, which has built-in firewall and hub capabilities. The working computer is connected via Ethernet, while the non-working one uses a USB cord. It is suggested to reset the router by powering it off for 30 seconds and checking for firewall settings that may block internet access. The possibility of the USB cord being too long is raised, recommending a switch to Ethernet if supported. Additionally, there is speculation that Norton Systemworks could be interfering with the internet connection. The user is advised to confirm if any changes were made to the setup that could have caused the issue.