There are various methods to bypass windows 7 password protection.In case you forget windows passsword,you can reset it using windows 7 Dvd or OfflineNT Password and Registry Editor.However if you have access to any windows account, then you can change the password without knowing current password.
Method 1:
Go to Control Panel and click on the Administrative Tools.
Under this section double click on Computer Management.
Select System Tools from right window pane.
Under this, just double click on Local Users and Groups and then on Users
Now you will see all the login accounts...