How to reset root password from slackware or any other linux distro :

1. boot from CD
2. type "mount" to see the device and mounting area from your distro (in this example, it's /mnt), if there isn't one, guess one (sorry can't help you with gambling). For this example, let's say you get lucky when you type "mount /dev/hda2 /mnt"
   
3. type "chroot/mnt"
4. type "passwd"
5. enter your new password
6. finish