The best I can figure is that the enumerator opens up the interface for the network devices making it possible for you to load and unload the drivers for your modem and networking devices.
You could also try installing this driver http://www.versiontracker.com/dyn/moreinfo/win/47371
NVIDIA Network Bus Enumerator - 188.8.131.52
This driver is a year old 10/2004. Must be some other drivers available. I would say you need to reinstall everything. Try uninstalling all the drivers using the acpi. Not a good idea to change a board and keep the same drivers. The board is not reading anything the same any more.
Just not worth the headaches trying to make the system work again. REINSTALL is the way to go. This way windows can install the files and drivers properly the very first time.
I have to ask was your drive formatted as 16bit or 32bit and which OS are you using?