Under Windows XP, if you use the logon "classic" - without the home screen - a window request the seizure of the username and password. By default, the name of the last user of the computer is displayed and you have the password to enter.
This trick also works with Vista and start your PC, you are invited (e) to enter your user name and password - although the opening session of "classic" does not exist.
If, for security reasons, you want this last name does not appear, just a small change in the registry.
- 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.
That way, if someone turns on your PC to log on, he must not only know the password but also the username.