You have two ways to use OPHcrack:
1. Create a bootable CD which requires no installation. Just download the ISO file and burn it to a blank CD and you will be good to go. Note: Make sure you change your system settings so that it boots from CD-ROM before your local drive. Usually pressing F2 or F12 at bootup gets you into your system settings.
Download Page for the ISO for XP and Linux or Vista. What? You don’t have a CD burning package? Then download ISOBurn, ISO Recorder or Create-Burn ISO. All three are free.
2. Install ophcrack while you are logged into a system and want to collect all of the login accounts and passwords before shutting down and possibly not be able to login again. Download the version you need here.
What you see is what you get
I’ve used it a few times and it works like a charm!