Although editing the registry is relatively simple and available to everyone (including domain accounts), it does pose a greater security risk than the other methods. The reason is the password for the account you want to automatically log on with is stored in the registry in plain text format.
That means anybody can go to the registry key where the password is stored and find out what it is, even while the system is offline and not booted. For that reason, this method should be used only if the others have failed. With both of the other methods above the password is encrypted.
- Click on Start and type Regedit, administrator privileges are required to run the Registry Editor. Alternatively use the Win+R Run dialog.
- Navigate to the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Read More: https://www.raymond.cc/blog/auto-login-windows-xp-without-typing-password/
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Hope this information can help you
Best wishes
Vicky