Most of us know that changing your Windows Vista logon password regularly is a good habit to help keep your PC secure. Changing your password in Windows Vista is pretty easy and is something you should do if you’re having problems remembering your current password.
Follow the easy steps below to change your Windows Vista logon password:
1. Click on Start and then Control Panel.
2. Click on the User Accounts and Family Safety link.
more ans source:http://pcsupport.about.com/od/tipstricks/ht/chgpassvista.htm