Cannot install updated Broadcom drivers on Dell PE1950

Try uninstalling the driver.

To uninstall a device driver, complete the following steps:

Open the Computer Management Console by right-clicking My Computer on the Start menu and selecting Manage.
Select Device Manager in the left pane of the console. The Device Manager will then display a list of installed devices in the right pane of the console.
Expand the category of the device you wish to uninstall.
Right-click the device and select Properties.
Select the Driver tab on the devices Properties dialog box.
Click the Uninstall Driver button.
A new dialog box will pop up asking you to confirm the uninstall. Click OK to proceed.
Shut down the system to remove the device.

This could also help.  (Should have posted it first)

To get rid of that unwanted driver, device, or service:
1) Open the Start menu and choose Run&
2) Type in cmd (without the quotes) and click ok.
3) At the cmd prompt, type in set devmgr_show_nonpresent_devices=13 (without the quotes) and press enter. (Note that nothing seems to happenthis is ok. We are actually setting an environment variable which is going to help us to see hidden devices)
4) On the next cmd prompt line, type in devmgmt.msc (without the quotes) and press enter. This will launch the Windows Device Manager Console.
5) In the Device Manager Console, from the View menu, select Show Hidden Devices.

This will remove the driver which appears to be corrupt.  Once it has been removed, reboot and being the install of the updated driver.

Here are the links I found the info from so that proper credit is given.

http://blogs.techrepublic.com.com/datacenter/?p=311
http://www.tech-recipes.com/rx/504/how-to-uninstall-hidden-devices-drivers-and-services/

Well, I don't want to uninstall the driver for fear that I won't be able to reinstall it if I do. If there are no other suggestions i will have to try this over the weekend with a backup NIC if I can't get the drivers reinstalled after removal.

I'm not sure that I have ever seen that happen.  Have you noticed any errors in the event viewer that would indicate a problem with the NIC?  You should see errors/warnings pointing at the NIC.  I understand your caution though.  Definitely not something you should do remotely.

Not doing it remotely, and event logs are clean. I'll contact Broadcom too to see if they suggest doing the same.

Good plan.

Broadcom contacted, hopefully they will have the answer for me.