there is a solution for those who has forgotten their password. With no reinstalling, with no the original password, with no data loss, you can reset the password. As following,

1. Login to a computer that can link to Internet. Download Windows Password Unlocker 4.0 at http://www.passwordunlocker.com and decompress it on that PC. Note that: there is a .ISO file. Burn the .ISO file to a CD.
2 Get out the newly created CD and insert it to the locked computer.
3 Re-boot the locked computer and then followed the process of instructions. Just a few steps, the old password was removed.''
'4 Setting new password:
Step one: Open the 'Control Panel'
Step two: Click the 'User Account '
Step three: Select the account you wanna to set a new password.
Step four: Click 'changing Account ' and 'set up password', then fill out the form as listed. Click 'Create Password'.

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