TCP/IP settings that can't be changed

>-----Original Message-----
>I am having trouble clearing some TCP/IP settings
>associated with the inbuilt NIC on my Sony Vaio Notebook
>running XP. The PC was recently used on a corporate
>network where the ocal IT people set it with permanent
>TCP/IP setting (i.e. address, mask, DNS etc). Now even
>though I have cleared all of these settings and ensured
>it's set to get it's address from a DHCP server, the
>previous settings are still there and I can't seem to get
>rid of them.
>
>I have had to revert to plugging a PCMCIA network card
>into the PCMCIA slot in order to get network and Internet
>connectivity.
>
>Is there somewhere that these settings could be
>overriding the settings I'm choosing. I have logged in as
>both administrator and administrator equivalent accounts
>to no avail. Doing both an "ipconfig" or looking at the
>network settings shown in the "details" panel on
>the "Network Connections" folder reveal that the TCP/IP
>settings from the corporate LAN are still there.
>
>Of interest is these couple of points:
>1. When this PC was added to the account an new login ID
>was created fro the domain of teh network it was added
>to. This new login DID NOT have administrative
>privilidges.
>2. There's another icon sitting under the "LAN or High
>Speed Internet" category on the "Network Connections"
>page and it's called "1394 Connection". I am not
>experienced at fixing Win2000/XP issues but I've never
>seen this before and don't know what it is for.
>
>Hope someone can help. Thanks.
>
>regards
>philip Dartnell
>
>.
>