Open Computer Management
In the console tree, click Users.
Computer Management > System Tools > Local Users and Groups > Users
Right-click the user account you want to change, and then click Set Password.
To open Computer Management, click Start, and then click Control Panel. Click Performance and Maintenance, click Administrative Tools, and then double-click Computer Management.
Strong passwords improve computer and network security. For more information, click Related Topics.
Creating strong passwords
Local Users and Groups overview
Change the password for a user
Create a new user account
Delete a user account
Disable or activate a user account
Modify a user account
Rename a user account