OS X lost password on used IMac

I've purchased a used IMac from a friend.  The windows Vista side boots and runs properly.  However, when booting to OS X (via bootcamp) i'm foiled by a password screen setup by the friend's son who is uncooperative and lost.  Is there a process to reset this password without original discs, or must I purchase and install updated OS X software?  thx in advance.

Four options.
1. strong-arm the son for the password
2. get the original discs from the friend (buying a machine w/o them is like buying a car w/o its spare tire and jack)
3. call 1-800-MY-APPLE and request replacement discs
4. return the machine
You need the discs so you can boot with them and reset the admin password, run the Apple Hardware Test program, and restore the software.

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