Enable Auto-Logon in Windows Vista
a) click Start and type 'netplwiz' or click that name on the Start menu
b) in the GUI window that comes up, uncheck the "Users must enter a username and password to use this computer" box
c) click 'Apply'
d) in the new dialog box that opens type the name of the account you want to auto-logon by default (if the account is not normally passworded then it blank)
e) click OK and exit