Help! Unknown Admin name and password!!

[Kaitlynmary]

I have a MacBook Pro, Mac OS X 10.6.3 and I don't know the admin username and password! I have the install disc but when I reboot it while holding C nothing happens at all !!
Please someone help!

 

[satcomer]

I saw this at another web site:

First, boot into Single-User Mode:

1. Shut down the computer if it is on.
2. Press the power button to start the computer.
3. Immediately press and hold the Command (Apple)
and the S keys until you see white text appear.

At the prompt, type fsck -yf and press the return key.
Type mount -uw / and press the return key.
Type rm /var/db/.AppleSetupDone and press return.

Type reboot