Boot in safe mode, that should get you past the admin password. Its the log in password, yeah? Not a BIOS password?
Best not to talk about cracked warez type stuff here though. Not sure on the specific rules, but I know that generally It can get forums in trouble 🙂
Also, you can format easily if you have a working computer. Just plug in the new HD to the old system, and boot up. Then in my computer right click the new HD and format. I suggest the long version of the formatting.
Give us a bell if you get stuck 😉