You have a computer that runs Windows Vista or Windows Server 2008. If you repeatedly restart the computer, some services occasionally do not start. For example, the TCP/IP NetBIOS Helper service and the DHCP Client service may not start. In this case, the following events are logged in the System log.

Log entry 1

Source: Service Control Manager
Event ID: 7001
Description:
The TCP/IP NetBIOS Helper service depends on the Ancillary Function Driver for Winsock service which failed to start because of the following error:
A device attached to the system is not functioning.

Log entry 2

Source: Service Control Manager
Event ID: 7001
Description:
The DHCP Client service depends on the Ancillary Function Driver for Winsock service which failed to start because of the following error:
A device attached to the system is not functioning.
These events indicate that the Ancillary Function Driver for Winsock (AFD) driver did not start. However, if you run the MsInfo32 program, and you check the System Drivers information under the Software Environment section, you find that the AFD driver is actually running.

Note: This problem is not specific to the TCP/IP NetBIOS Helper service or the AFD driver.