Reset Your Windows Password for Vista/XP

Both Windows Vista and XP have a user password control utility that allows you to reset a user's password. This utility is convenient if you forgot one of your user passwords or you want to reset a user password for a friend or coworker who logs in to the desktop. The administrator can reset  Windows password on each of the user configured on the Windows system.
Method 1:
Step 1: Click the Windows "Start" button. If you have XP, click "Run." Windows Vista has the command text box directly in the "Start" menu popup. Type "control userpasswords2" and press "Enter" to open the utility.
Step 2: Click the user name you want to edit. Click the "Reset Password" button at the bottom of the user list. This button opens a new window where you type the new password.
Step 3: Type the new password in the "Password" text box. Type it again in the "Confirmation" text box. Click "OK" to save the settings. Repeat this step for each user you want to change.
Method 2：
If you have an available account with admin right, you can reset Windows Vista/XP password in Safe Mode. Safe mode is an optional method of loading Windows with the minimal number of drivers. This basic mode allows you to troubleshoot computer problems and to gain access if you have forgotten a user account password.
Step 1: Boot into safe mode by clicking "Start" and then the "Shutdown" option, and then from the drop-down menu click "Restart Computer." After the computer screen goes blank, hold down the F8 key until the Boot Menu appears.
Step 2: Log in as Administrator by entering the administrator password in the "Password" field. If there was no administrator password set, leave it blank.
Step 3: Open the Control Panel by clicking "Start" and then "Control Panel." Choose "User Accounts" and then "Change an Account." Click on the account for which you need to change the password. Choose "Change the password," and type a new password.
Method 3:
Well, there are also other ways to reset Windows password on Windows Vista/XP with Windows password recovery tool. Window Password Unlocker is such a kind, which allows to reset the forgotten Windows Vista/XP password with a bootable CD/DVD/USB flash drive.  4 steps you can follow to change or recover the password.
1. Download and install Windows Password Unlocker Professional
2. Burn a bootable CD/DVD or USB to remove lost Windows password.
3. Set your target computer to boot from CDROM or USB flash drive

4. Insert the burned CD/DVD or USB flash drive into the locked computer and reset password successfully.