After clicking the Download ophcrack LiveCD button in the previous step, the webpage above should display.
Click the button corresponding to the version of Windows on the computer you'll be recovering the password on.
In other words, if you've forgotten the password on:
- Windows 7: Click on ophcrack Vista/7 LiveCD.
- Windows Vista: Click on ophcrack Vista/7 LiveCD.
- Windows XP: Click on ophcrack XP LiveCD.
Just to be clear, the operating system of the computer you're using right now doesn't matter. You want to download the appropriate Ophcrack LiveCD version for the computer that you're cracking the password on.
Note: Don't worry about the ophcrack LiveCD (without tables) option.