1. Click Start, click Control Panel, and then double-click User Accounts.
2. In User Accounts, in Make changes to your user account, click Change your password.
3. In Change your password, in Current Password, type your password.
4. In New password, type a new password.
5. In Confirm new password, retype the password.
6. In Type a password hint, type a word or phrase that will remind you of your password or, optionally, leave this field blank.
7. Click Change password.
Alternatively to change the password:
1. Click Start, click All Programs, and then click Accessories.
2. Right-click Command prompt, and then click Run as administrator.
Type at the command prompt:
net user username newpassword
Replace username with your username.
Replace newpassword with your new password.
The password is now changed.
Password requirements:
The minimum password length is 12 characters.
Passwords must contain characters from three of the following four categories:
Uppercase characters of European languages (A through Z, with diacritic marks, Greek and Cyrillic characters)
Lowercase characters of European languages (a through z, sharp-s, with diacritic marks, Greek and Cyrillic characters)
Base 10 digits (0 through 9)
Nonalphanumeric characters: ~!@#$%^&*_-+=`|\(){}[]:;"'<>,.?/