Enable Auto Logon as a Domain Member
Follow these procedure to force Windows Vista and Windows XP to skip and bypass asking user for user to select or input user name and password:
- Click Start, click Run, type regedit, and then click OK. In Windows Vista, simply type regedit in Start Search and hit Enter.
- Navigate to the following registry key:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- Double-click the DefaultUserName entry, type the user name to log on with, and then click OK.If DefaultUserName registry value name is not found, create the new String Value (REG_SZ) with value name as DefaultUserName.
- Double-click the DefaultPassword entry, type the password for the user account under the value data box, and then click OK.If there is no DefaultPassword value, create a new String Value subkey (REG_SZ) with DefaultPassword as the value name.Note that if no DefaultPassword string is specified, Windows automatically changes the value of the AutoAdminLogon registry key from 1 (true) to 0 (false) to turn off the AutoAdminLogon feature.
- In Windows Vista, DefaultDomainName has to be specified as well, else Windows will prompt of invalid user name with user name displayed as .\username. To do so, double click on DefaultDomainName, and specify the domain name of the user account. If it’s local user, specify local host name.If the DefaultDomainName does not exist, create a new String Value (REG_SZ) registry key with value name as DefaultDomainName.
- Double-click the AutoAdminLogon entry, type 1 in the Value Data box, and then click OK.If there is no AutoAdminLogon entry, create a new String Value entry (REG_SZ) with AutoAdminLogon as the value name.
- If exist, delete the AutoLogonCount key.
- Quit Registry Editor.
- Click Start, click Restart, and then click OK.
After computer reboots and Windows XP or Vista starts, system can log on automatically to the preset or predefined user in the registry.
Source Taken:how to enable auto logon to windows xp and vista joined as domain member

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