How to Configure Windows XP to Automatically Log On a User Account
For Windows to automatically log on a user account during the startup process, the following must be met:
- The Welcome screen must be available
- Guest account access must be turned off
- There must be only one user account on the computer
- The user account must not have a password
To make the Welcome screen available:
1. Click Start, click Control Panel, and then double-click User Accounts.
2. Click "Change the way users log on or off".
3. Click to select the "Use the Welcome screen for fast and easy logon" check box.
4. Click OK.
To turn off Guest account access:
1. Click Start, click Control Panel, and then double-click User Accounts.
2. Click the Guest account.
3. Click "Turn off Guest access".
To remove the password from the user account:
1. Click Start, click Control Panel, and then double-click User Accounts.
2. Click the user account.
3. Click "Remove my password".
4. Type the password in the "Type your current password" box, and then click Remove Password.
Source:
http://www.kellys-korner-xp.com/win_xp_logon.htm