Well I am new and just found out about this board today so I decided to join seeing how I am a techie at heart.:D Anyhow I work as a PC Tech for TEK Systems which is contracted to the military to install the new NMCI network for the Navy and Marine Corps. If you don't know already the NMCI...
I work on secure networks for the military so I do have some experiance here even though I am new here, HI EVERYBODY :D.
Anyhow back to your problem I know that you said you can ping the other three and when you run IP config it shows the correct into, but try running IPCONFIG/release then...