Once you lost Windows 7 password, you can try the following methods to bypass or reset the lost Windows 7 password.

Method 1: Use the password hint to help you remember the forgotten Windows 7 password.
When you create or change your password, you have an opportunity to type a hint to help you remember it. Your password hint should be a word or a phrase that is vague enough so that nobody else can guess your password, but clear enough that it will remind you of your password.

Method 2: Use the Windows 7 password reset disk to reset the forgotten password to a new one. Windows 7 allows their users to create a password reset disk before the password is forgotten.

Method 3: If you have another accessible user account with administrator permission, use that administrator account to reset your lost password for Windows 7.

Method 4: Try to enter safe mode with administrator rights, and then fix your problem with command prompt.

Method 5: If you have an installation CD or system repair disc of Windows 7, then you can access the recovery options to reset your lost or forgotten Windows 7 password.

Method 6: To retriever or to reset lost Windows 7 password by getting a free Windows password recovery tool, like Ophcrack.

Well, these methods didn't work for you? Why not consider purchasing a commercial Windows password reset tool, like Windows Password Breaker Professional, which enjoy great popularity among forgotten Windows 7 password users. Although it will cost you a few dollars, it is much cheaper than resorting to an expensive PC expert or reinstalling Windows. It is worthy of its price if you ever used it.

Unlike Ophcrack recovering forgotten Windows 7 password, Windows Password Breaker Professional will reset the password to blank. So it's a Windows password reset tool, actually. Besides, it can reset Windows 7 password in minutes, no matter how long and complicated your password is. Most importantly, it claims 100% reset rate without any data loss or damage. Just have a try if you lost Windows 7 password.