IPAddr
SYMPTOMS

This is an edited copy of a Microsoft Knowledge base article
When you start Windows, you may not receive a Windows or a network logon dialog box, or you may receive any of the following error messages:

You may also find that the Change Passwords tab may be missing from the Passwords Properties dialog box.

Note that if you were not prompted to log on but you subsequently choose LOG OFF from the Start Menu, you will then receive the prompt to log on and will be able to do so.

CAUSE
This behaviour can occur if either the Primary Network Logon setting is not set correctly or the following entry appears in the following registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Network\Real Mode Net
AutoLogon=xx

NOTE: The AutoLogon value must be a BINARY value and must be set to 00 for automatic logon to work.

RESOLUTION
Use the troubleshooting steps that are listed below to resolve the problem. Make sure to restart Windows after each step and test to see if the problem is resolved.

NOTE: You can edit the registry by using Registry Editor (Regedit.exe).

Troubleshooting Steps
Click Start, point to Settings, click Control Panel, and then double-click Network.
Click the appropriate setting in the Primary Network Logon box, and then click OK.
Delete the following entry in the following registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Network\Real Mode Net
AutoLogon=xx

This problem can also occur if the following setting is listed in the registry under the following registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Network
Disable Password Caching

Whether the value is set to 0 or 1, remove it to resolve this issue.