@phenix: Do not use "an older Linux", developers do not update their programs without a reason, it could be anything from security updates to normal bugs, new features or hardware drivers. I suggest that you read around at
www.distrowatch.org, there you will find loads of info about more than 100 different distributions.
If you try one of big, Ubuntu, Fedora, Mandriva or SuSe, you will get a highly automated dist that is very easy to install, and i mean very easy if you do not have any exotic hardware. But for a nerd like me, those distributions are not simple, clean and friendly, but for the newbie they are. If you want to get your hands dirty, do everything manually, editing every option there is your self and really learn the unix-way, i would suggest Slackware or one of those sourcecode distrubutions like Gentoo, those dists are KISS (Keep It Simple Stupid) simple in the same way as a large format camera. But the learning curve will be _very_ steep for a newbie, though Gentoo have a very good community and a lot of howtos and documentation.
For your old box a standard installation of one of those big distributions, will be to much. Way to heavy in graphics. But any one of them can be set up much lighter than standard. Linux is just a kernel, a quite small program, Linux itself do not require much, but you cannot use Linux by itself. For the graphics, all distributions use the X-window system (Mac-OS also), then on top of X you have either a desktop environment (for modern computers) or you can settle on a much lighter window manager. I would recommend IceWm that is quite like W-95, IceWm can be used on an old 100mhz i486. Ubuntu has also a version that is called Xubuntu, that one is much more suitable for older computers, and Ubuntu has the largest community to get help from. Just fool around for a while, and do not mix up hard-to-use with lack of knowledge, things are very different "under the hood" in a linux-system compared to windows. Remember that linux can be used in any machine from a wrist-watch to a mainframe super-computer cluster, that is one reason behind a lot systemdesign, it is very adaptable. Anything you want to change, is possible to change, everything is open to those willing to learn and take control, everything.
So, welcome young Skywalker, may the force be with you.