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> how to clear login history in win xp?
> which file to look for?
Do you mean "Do not display last user name in logon screen" ?
* Open the Registry Editor.
* Go to the key HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows
\ CurrentVersion \ policies \ system
* On the right, locate the key dontdisplaylastusername
* Right-click to edit and set its value to 1
* Restart the computer.