I've had this happen twice now within a couple of months. One of our external laptop users called and couldn't get onto the network so we took a look at his machine. There was an error 7000:
"The AFD Networking Supoport Environment service failed to start due to the following error: The system cannot find the file specified."
The file AFD.sys was missing from the c:\winnt\system32\drivers directory. I replaced the file and it works fine.
My question is what would cause this file to be deleted? We use a Winnt domain and the users connect with cable to our VPN. Any ideas?