Here is an easy way:
1. When the login screen comes up hit ctrl-alt-delete.
2. The old (win 9x) login screen comes up. For username type: Administrator
password: (leave blank).
3. This logs you in to the administrator account which is usually hidden by default. Go to start-->run-->type in cmd.
4. In the command prompt type the following exactly: NET USER {username} {new password}
where {username} is the name of the account you are trying to recover and {new password} is any password you want
5. Hit enter, a message should appear saying command completed succesfully.
6. You now have a new password.
