Outlook connection to LAN

I have one user with a laptop configured to connect to my
Exchange 5.5 sp3 server. All was working well until this
user had a Comcast tech. set up her laptop to connect with
her new cable modem. Now Outlook does not appear to see
the LAN connection. As soon as I try to connect to the
Exchange server, I get a promt to retry, work offline or
cancel. If I hit retry, the message pops back up as fast
as the screen can redraw. Internet Explorer works fine.
I can ping my exchange server from a command prompt using
only the server name. I can not find any software or
utilites installed by Comcast. The laptop had Office
2000. I upgraded to Office XP SP2, this has not helped.
AOL is installed on this laptop, and there is a LAN
connection with a WAN network driver from AOL. I have
this disabled. The only other LAN connection is the one I
have setup and IE is using this one fine. Any suggestions
as to how to get outlook to see the network would be much
appreciated.

Will

Ok...I feel like a dunce. Microsoft Networking Client had
been removed.

Will