Download
Ophcrack for the right OS.
Then download
The Official ImgBurn Website
and install this
If you havent ever burned an ISO then hit me up. I also have other programs but this will be the easiest.
Install IMG burn and you should be able to double click on the iso file you downloaded for oph crack. when you double click it should bring up a prompt to burn the iso to the disk, tell it yes, etc. Then restart your computer and press F12 at boot, it should ask what you want to boot from. if not go into your bios and set it to boot from CD. it should then go on its own and harvest all the passwords for the computer. If that doesnt work I have other means.