I am trying to reinstall an admin password and got completely locked out. I can't get past the first log in

I am trying to reset my admin password.  I think my computer was tampered with. I signed out completely and now, I am locked out.  I can't get past a black screen. I'm unsure of my operating system but I've had laptop about 2 years.

If you boot from your install DVD and, after choosing language, go up to the Apple bar and select utilities, you can restore you admin and firmware psswds. You will these options there. Do not choose a firmware psswd if you do not need this, you may complicate your life, especially if you forget it.
I do not understand how you changed the psswd and why you cannot log in, though. Did you forget the new psswd or why? What do you mean by ‘was tampered with’?

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