I have a Dell desktop with Windows XP SP3 that does not connect to the Internet. All other computers work including another computer using the same Cat5 cable and port. The PC does take an IP address from the DHCP and is able to ping the gateway - DHCP and Gateway are a single CISCO 1700. I am also able to resolve names on NSLOOKUP. However I am not able to navigate on the Internet nor I am able to ping addresses outside from the network. I have disabled the firewall & antivirus and have uninstalled and installed back the NIC driver at the Device Manager. I have removed and placed back the Internet Protocol and Client for Microsoft Network services from the NIC properties. I am about to reformat and make a clean install but will appreciate any suggestions before I do that.