When you lost windows 7 admin password, what can you do? Reinstall system? No.
You do not have to do that, it can remove the password indeed, however, it delete data in your hard drive. You can use some tools
to recover or reset the password.
The first tool you need is Password reset disk. With this tool, you can easily reset the
password. If you have created one before, you can reset the password easily
The second tool you can try is Ophcrack, the free and most popular password recovery tool,
it can help you recover the password if you password is less than 14 characters.
The third one is Windows password unlocker, which is a good tool to reset password using
the password reset disk it creates.
See more information here
how to bypass windows 7 password
how to reset windows 7 password