As long as security isn't a big concern, configuring Windows Vista to logon to your user account automatically can save you some serious time and effort when your computer is starting up.
Just follow the easy steps outlined below to make Windows Vista automatically logon to your user account. After completing these steps, Windows Vista will stop prompting you for a user name and password on startup!
Click on Start, type the following command in the search box, and then hit the Enter key.
This command will load the Advanced User Accounts Control Panel applet.
In the Users tab, uncheck the box next to Users must enter a user name and password to use this computer.
Click on the Apply button at the bottom of the User Accounts window.
When the Automatically Log On dialog box appears, enter your password in the two fields where it's asked and then click OK.
Click OK on the User Accounts window to complete the process.
From now on, when your PC starts up, Windows Vista will log on automatically.
Not a Windows Vista user? See How Do I Auto Login to Windows? for auto login instructions for your version of Windows.