Well, here goes...
I am running an x86 NT4.0 SP3 server which has been up, without incident, for a couple of months. Last week, I came in to find a blue screen/hex dump up on a crashed server. I swallowed hard, wiped the sweat from my brow and rebooted. It worked, things seemed to be just fine. Of course this didn't answer the "Why?" of the situation.
This morning (Monday) I came in to find my Win95 clients weren't finding the DHCP server on the network. I'm sure this problem existed last week but my leases hadn't yet expired. I eventually reinstalled SP3 and -BINGO- IP addresses flow once more!!
So, the question, what happened? I know there may not be an answer to this one but... Also, when I go into "SERVICES" I find a DHCP Client service loaded but not running. When I hit "START" I get the error "Could not start the DHCP client service on \\SERVER_NAME. Error 2140: An internal Windows NT error occured".