I am still having trouble with this laptop. It is a dell Latitude D510 with Windows XP Professional. Almost everytime I walk away for an hour or two I come back to a screen that say this computer has been locked. Only ( my user name ) or an administrator can unlock this computer. Press control-alt-delets to unlock. Then I have to unlock it again. It is getting old doing this 5 or 6 times a day. How can I disable this? Thanks!