do you have the CD? if so do the following in a command line, I use the boot parameter linux26 2(this will give you the 2.6 kernel, and runlevel 2)
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mkdir /newroot
mount /dev/(root) /newroot
chroot /newroot /bin/bash
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this will give you a root prompt
this will allow you to change the root password.
Reboot
hope this helps