|Is this a home network? If so, I suggest logging in to whatever you have doing your DHCP. Look at the DHCP scope and make note of it. Then, try statically (manually) assigning an IP address that is in the subnet your home network uses, but is outside of the DHCP scope to that problem computer. Don't forget to give it the correct subnet mask, DNS, and default gateway IP's as well.|
If you can't assign an IP then you're having issues with the interface. It could be a physical (hardware) issue with the NIC, or it could be drivers or the TCP/IP stack.
If you can't, I suggest first trying to update the drivers for the NIC. If that doesn't fix the issue, you can try uninstalling, then reinstalling the TCP/IP stack. If that doesn't do it, you may need to replace the network interface.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.