Macbook Pro 10.5.8 reset password

Tried to use my install disk, but the drive won't read it. Is there another way to retrieve my admin password. I can't remember it.

No, but you can reset it to a new one.
Boot into single user mode (press Command-S at power on) and press enter after each of these commands.
fsck -fy
mount -uw /
launchctl load /System/Library/LaunchDaemons/com.apple.DirectoryServices.plist
(that's all on one line.)
ls /Users/
(if you don't know the name of the user)
dscl . -passwd /Users/username password
(replace the username with the targeted user and password with the desired password)
reboot
This allows you to reset the password in single user mode without booting from the install media.

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