[Thermodyne]

Stand alone? Or domain member? If stand alone, was it ever a domain member or a client on a managed network?

Sounds like a proxy or gp issue, but it depends on what may have been done to it in the past. If it is a domain system, then YMBF. Also, it could be a DNS issue. UnkyS's boys have been doing some simms the last day or so. Try pinging your DNS servers, and perhaps add some of the big public servers to your list.