Enable Auto Login - Windows XP

Below are the procedure for XP Auto login :

Start -> Run type regedit then click OK

Locate the following registry entry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

In Right Side Pane :

Double-click on DefaultUserName then type your user name as value and click OK
Double-click on DefaultPassword then type your password as value and click OK

If there is no entry like DefaultPassword, then create it using the following steps:

Rightclick and select New, and then select String Value
Type DefaultPassword as value name and Press OK
Double click on newly created entry and type your password there as value

If DefaultPassword string is not specified then Windows XP automatically changes the value of AutoAdminLogon key from 1 (true) to 0 (false) to turn off AutoAdminLogon facility.

Double-click on AutoAdminLogon entry then type 1 as value and Press OK

If there is no entry like AutoAdminLogon, then create it using the following steps:

Rightclick and select New, and then select String Value
Type AutoAdminLogon as value name, and then Press OK
Double Click the newly created key and type 1 as value

Close Registry Editor

Restart your PC, now your XP can log in Automatically.