I would not go with slackware if I were a noob. I think the best distro to start out with would be either Mandrake or Redhat. Both are relatively easy to install and use.
If you want to just try linux out without and committment I would reccomend looking at Knoppix. This is a CD based distro of Linux that runs completely from the CD. You can use this without modifying your HD at all

Take linux for a risk free test drive
Jkrohn