Win XP Pro connection

I have a small workgroup with 6 computers on it. I have one computer which I cannot get to connect to the internet at all. It is visible to the other workgroup computers and I can access it through remote desktop without any trouble. I’ve tried using a different port in the switch and using a swapping cables from a computer I had no trouble with but no luck. If I set it to DHCP it will connect for a few hours then go “Offline” again. I’m thinking I may have a bad NIC but not sure. This is a brand new computer I added to the workgroup to replace one that finally died.

Any suggestions would be greatly appreciated.