DL380 G2 hangs after network driver upgrade

[Apu]

We have a DL380 G2, currently running Windows 2000 Server (trying to get ready to do an in-place upgrade to Windows 2003 Server), that now hangs on any attempt to boot.

The recent changes were installing HP NC31xx Fast Ethernet NIC Driver for Windows 2000 (8.0.21.0 B) and HP Network Configuration Utility for Windows 2000 (8.37.0.0). (Was running 5.?? versions of each - needed to upgrade for Windows 2003 Server.)

On a regular boot, you get to the graphical boot progress screen -- the upper bar continues to scroll but the lower bar stops at 13 blocks filled in.

Trying safe mode, the white-on-black progress screen gets to the point where the white progress bar is complete before it hangs.

Last Known Good Configuration or VGA mode gets to the same point as a regular boot before it hangs.

(Dual 1.266 GHz processors, 4 GB RAM, SmartArray 5i has no drives connected, SmartArray 5300 has six physical drives and two logical drives, P24 BIOS dated 8/17/2002)

Any thoughts on how to get this system up and running?