I have a home network on the go, behind a D-Link DI-704 router, DHCP on the thing. I have a brand spanky new machine running Win XP Pro w/ Asus A7N266-VM MB, Lan onboard, NVidia chipset. The mahcine will boot up and get an IP, as well as all the gateway and DNS info from the router, and the router recognizes the lease of the ip to the MAC of the computer. Here's the funky part. It will not allow me to renew the IP - says "operation failed". I can ping the other computers on the network, which work fine. I can ping the gateway, and I can ping through the gateway to my ISP's gateway (it's connected to Rogers Cable). I can even browse and see and download from other computers on the network. But be damned if it will in any way access the internet. Sometimes, it will allow me to connect for the first 30 seconds or so, but then it just stops working. I'm out of bloody ideas here. I've uninstalled and re-installed XP, the drivers, the card under Device manager - even tried another seperate PCI card that I know works, same problem - so it's some damn software issue - I've eliminated all the hardware issues. Anyone, absolutely *anyone* have any ideas about what I can try - I even copied the Winsock registry settings from another computer, to no avail. Please - I'm dying here.

Here is some ideas. Plug straight into the internet, bypass your router. If that works, then you have a router problem, so restore your router to factory defaults or try to fix it manually. Are you using a software firewall? If so, try uninstalling it and see if that fixes your problem. Maybe look and see if any trojans are on your box? It almost sounds like something might be blocking your ip address for some reason.