Lost my password for my Windows 7 laptop

I had this laptop for 3 years the screen was broken I just replaced it but I don’t remember the password to get into the computer please help my laptop is Acer Ferrari F200 one
Answer #1
Get hiren’s bootcd, burn it to a disk, boot from it then follow this guide to remove it:
http://www.hirensbootcd.org/download/
http://www.hirensbootcd.org/resetting-windows-password/
Answer #2
Just use this boot cd:
http://www.pogostick.net/~pnh/ntpasswd/
Small & Effective. Hiren includes it too, But why bother downloading a 590MB ISO
when you only need to use a single tool that is available in separate?