Automatic Logon

http://www.webattack.com/get/tweakui.shtml

Download TweakUI.exe from the above site and install the program.

Click Start, click Run, type regedit,and then click OK to start Registry Editor.
Locate the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon

Using your account name and password, double-click the DefaultUserName entry, type your user name, and then click OK.
Double-click the DefaultPassword entry, type your password under the value data box, and then click OK.

If there is no DefaultPassword value, follow these steps to create the value:
On the Registry Editor menu, click Edit, click New, and then click String Value.
Type DefaultPassword as the value name, and then press ENTER.
Double-click the newly created key, and then type your password in the Value Data box.
If no DefaultPassword string is specified, Windows automatically changes the value of the AutoAdminLogon key from 1 (true) to 0 (false) to disable the AutoAdminLogon feature.

Double-click the AutoAdminLogon entry, type 1 in the Value Data box, and then click OK.
If there is no AutoAdminLogon entry, follow these steps to create the entry:
On the Registry Editor menu, click Edit, click New, and then click String Value.
Type AutoAdminLogon as the value name, and then press ENTER.
Double-click the newly created key, and then type 1 in the Value Data box.
Quit Registry Editor.
Click Start, click Restart, and then click OK.
After your computer restarts and Windows starts, you can log on automatically.

With XP, get the new XP version of TweakUI. It is on the XP PowerToys page located here:

http://www.microsoft.com/windowsxp/pro/downloads/powertoys.asp
(please remove any spaces)

Install it, then open TweakUI from the Control Panel. Then click the Logon tab, enter in the username and password you want to auto-logon with, click OK, then reboot and watch the magic.

hope this helps