I found the solution to my problem. I uninstalled both the Broadcom programs and then downloaded the latest driver from the Dell support website. This worked. I then downloaded the Broadcom diagnostic utilities from the website and all is well.
  I recently reinstalled Windows XP Home edition version 2002 Service Pack3 on my Vostro 1000 laptop.  Problem: The Ethernet connection now does not work and Windows does not recognize the existence of a wired connection.  However, my wireless card does work ok so I think the problem is with the Ethernet driver. I installed the drivers from the CD supplied with the machine, not realizing that the order of the installations was important, so I then I reinstalled the drivers in the correct order, but to no avail. I have also tried downloading drivers from the Dell website without success. The driver for the Broadcom 4401/B0 Integrated Controller simply does not want to load. I have tried it from the CD and also from the website but the problem seems to be with the installer which jumps over installation and states that I have chosen to REMOVE the driver which, of course, is the opposite of what I am trying to do.   The Ethernet controller did work ok before I reinstalled Windows. I would very much appreciate any help. 
Vostro 1000 after reinstalling Windlws, the Ethernet connection now does not 
work and Windows does not recognize the existence of a wired connection.