Here is the answer thanks to James McDonald of Australia:
have a Windows 2003 SBS SP1 box on a Dell PE750. As a disaster
recovery trial I decided to try and recover it to a Dell PE1950 which
obviously has different hardware. The PE750 has $B!H(BIntel Pro/1000 CT$B!I(B
nics and the PE1950 has $B!H(BBroadcom NetXtreme II GigE$B!I(B Nics not to
mention different RAID controllers.
Backups are done via Veritas Backup Exec 9.1 for SBS. So I followed
the restore procedure from Veritas (Doc ID: 243037).
I ran into problems after I restored the OS (System State) to the new
hardware.
The Symptoms:
After restoring the backup from the PE750 to the PE1950. The Broadcom
nics worked but kept being re-detected evey reboot. Every time the add
hardware wizard was run to re-install the drivers the error was $B!H(BFatal
Error During Installation$B!I(B.
The Cause (I think):
Incorrect version of C:\windows\system32\drivers\wdf01000.sys not
allowing the install to run.
The Resolution:
The remedy was to boot to safe mode with networking, rename the
wdf01000.sys file, and then from device manager update the drivers
using the driver files that dell copies to c:\drivers\R166055
More Info:
There are some trouble-shooting steps here
http://www.microsoft.com/whdc/Driver...F_install.mspx which
explains where to look. I used notepad to open C:\Windows
\wdf01005inst.log and found the error message $B!H(BFileVersion of C:
\windows\system32\drivers\wdf01000.sys is greater than 1.5.5600.0$B!m(B.