Recent updates break NVidia onboard NIC network connection

After installing updates KB931174 KB905866 and KB931621 and restarting my PC,
my network connection stopped working. Vista (Enterprise) reported that the
problem was caused by a hardware fault. I uninstalled all 3 updates one at a
time in the order listed previously and rebooted after each was uninstalled,
but the network connection issue was only fixed after a 4th reboot. The NIC
is on board my ASUS A8N-SLI and I am currently using N-Vidia's latest Vista
32 bit drivers (version 15.00). A "Problems and solutions" message has
appeared following removal of these update that shows problems reported with -

MPU-401 Compatible MIDI Device
Ralink Technology Corporation (for the NIC)
Realtek HD Audio Sound Effect Manager

as well as a couple of software related problems.

Anyone else experienced problems with N-Vidia chipsets?

Been running fine for a couple of months, and still OK now I have
uninstalled these updates.