No es muy recomendable por motivos de seguridad, sin embargo en ciertos entornos como en tu casa, puede interesarte que Windows entre sin tener que poner un usuario ni una contraseña (que ya tarda mucho al arrancar).
Para hacer esto tienes dos maneras. Ambas se escriben en Inicio>Ejecutar (la caja blanca que también puede accederse desde la tecla de Win+R). Y escribe (y pulsa ENTER):
control userpasswords2
o
netplwiz
Este último para Vista y Windows 7.
Ahí se abre una ventana como esta donde podemos jugar con las opciones. Si desmarcamos la primera casilla preguntará con qué usuario y contraseña debemos entrar por defecto. Y ya está.
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