Windows 7 - Forgot Windows 7 Ultimate x64 Administrator Password

I was away from home for almost two months. When I came back home I discovered that somebody at home has changed the Administrator Password and they forgot the new password.
So I am locked out of my Dell INSPIRON N5010 laptop running Windows 7 Ultimate x64 OS. There is no guest account set on my PC.
I also have not setup Password Reset Disc.
Can any body help me access my PC again

Thanks in advance for helping!

Why not ask around your home and get the password from the person who reset it?

nobody remember the password I have tried it to my best. SO remembering the password is not an option now. Please suggest me some alternate way!

A search on Google will reveal so-called password retrievers.

Failing that, re-install Windows and make sure no-one but you knows the password.

Can you explain how to reinstall windows when I am locked out of my pc!

Clean Install Windows 7



Did you make the OEM manufacturer's Recovery Disks?

No need for the sarcastic comment, we're only trying to help.

You can still recover your system with your Dell recovery discs if you had the foresight to create any.

If you don't have any, Dell will sell you a set for a small sum.

Failing that, you can beg, steal or borrow a Windows 7 DVD and use that with your Dell's product key to activate it.

Clean Install : Factory COA Activation Key

Maybe this will help you before trying to re-install windows 7 as your last resort;

Reset Windows Password w/o an Install CD - HTG or
Reset your Forgotten Windows Password

It's worth a try before starting to re-install windows from scratch...

How to use Dell Recovery Partition,make Recovery Disks & how to order Recovery Disks.
Dell - Support