If you have an Ubuntu Live CD, you can get back into your computer without any password reset disk.
Features:
Here’s How:
1. Download the latest Ubuntu ISO and burn it to a DVD or CD disc.
2. Boot the locked computer from the disc.
3. Click Try Ubuntu.
4. Reset your Windows 7 password after following all the steps.
For more details, please go to How to Change Windows User Password with Ubuntu Live CD