Microsoft includes a password recovery tool iin XP. That should be available in Vista as well. When first assigning a password in Windows you have the option to prepare a password recovery floppy in the event you get locked out by simply forgetting what the password is. This can be used on any accounts especially the administrator to gain access to that specific system. This is one thing to do when first installing Windows or creating any new accounts where a password is then being assigned. If you were running XP the following instruction for automatic logon to Windows would be an edit of the system registry. But without any experience with Vista is a different matter. The instructions here where found in a free registry guide from
winguide.com
Windows includes a feature that allows you to configure the computer to automatically logon to the network, bypassing the Winlogon dialog box.
To enable this function you need to add several new values to the key below.
Add a new string value named 'DefaultUserName' and set it to the username you wish to automatically logon as.
Add a new string value named 'DefaultPassword' and set this to the password for the user entered above.
Add a new string value named 'DefaultDomainName' and set this to the domain of the user. Ignore this value if the NT box is not participating in NT Domain security.
Add a new string value named 'AutoAdminLogon' and set it to either '1' to enable auto logon or '0' to disable it.
For Windows 2000 the additional ForceAutoLogon setting must be enabled to stop the tweak from resetting on reboot.
Exit and restart, Windows should not ask for a password and automatically show the desktop of the user.
Note: The password is stored in registry, which means anyone who has access to the machine has access to the password.
Note: You can bypass this function by holding down the SHIFT key during the boot or logoff process.
Note: It is also important to note that if the DontDisplayLastUserName value is enabled, the auto logon feature does not function.
(Default) REG_SZ (value not set)
AutoAdminLogon REG_SZ "1"
DefaultUserName REG_SZ "jbloggs"
DefaultPassword REG_SZ "blog123"
DefaultDomainName REG_SZ "BLOGLAND"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Settings:
System Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
Name: AutoAdminLogon
Type: REG_SZ (String Value)
Value: (0=disable, 1=enable)"
Looking into the password recovery tool for Vista would be strongly advised over attempting to add these precise vaiues into a Vista registry.
http://windowshelp.microsoft.com/Windows/en-US/Help/e5e3d8ca-2e6f-4432-a01f-459644984f901033.mspx