The only way I know how to get around the lost login password is to access your win7 OS through a WinPE CD [or DVD].
That will get you into your OS.
Then, you can disable the password.
You may have to look around, but there should be a free download of Windows PE available online. Then, all you need to do is burn it to a CD or DVD.
Of course, you'll need to know how to go about disabling the password too.