Here's how to get rid of the welcome screen, and allow your computer to automatically logon upon boot. Thanks to TweakXP for the info.

Note: This is not a good idea in an open environment, such as the office, but makes sense for the Home PC, especially when there is only one user account and no password.

1. Click Start on the Windows taskbar, and then click Run.

2. In the Open box, type:

control userpasswords2 

then click OK.

3. In the dialog box that appears, you'll see: "Users must enter a user name and password to use this computer" check box. Enabled will require users to logon, disabling will make XP automatically logon to the Administrator account.

4. Go to Control Panel / User Accounts, and click “Change the way users log on or off”, and untick both “Use the Welcome Screen” and “Use Fast User Switching”.