So far, I think that the most effective way to bypass a lost Windows 7 password is to use a Windows password recovery tool like Windows Password Unlocker, which allows you to regain instant access to your locked computer in an easy, safe and fast way.

To reset lost Windows 7 password with Windows Password Unlocker, you will need to find a computer that you can run as administrator, and prepare a blank CD/DVD or USB flash drive. Please note a CD-ROM&RW drive is required if you plan to use a blank CD/DVD for Windows 7 password recovery.

Here is how it works: Download and install Windows Password Unlocker in the computer that you can run as administrator, then burn a bootable password reset disk with a CD/DVD or USB flash drive. It will take you only one simple click to create a password reset disk. And when the password reset disk created, you can restart your locked PC form the password reset CD/DVD or USB flash drive. You will find all user accounts on the computer with its password status displayed under WinPE. There you can select your target user to reset its password to blank.

It is estimated that the whole Windows 7 password recovery process will cost you no more than 5 minutes. No any loss or damage to your computer data or settings will occur during or after Windows password recovery resulting from its ready-only and non-destructive abilities.

Of course, there are also many other ways to reset the password on Windows 7, like some kinds of freeware, Ophcrack. Or you can use the password reset disk or password hint to get back your logon password.