Recommending that someone try Linux on their P3/4 with 1/2 GIG of memory and a 80GB HD is a snap even for a newbe... but definitely, not the same experience on an older rig.
IMHO to run the latest Distros with acceptable performance levels requires the same resources as if one were running W2K or even (arg) XP. Modern Linux Distros use resources (nearly) as much as any other OS, so, if you insist on running minimalist hardware, then you should be thinking in terms of a minimalist Linux configuration.
It is essential that you know 'all' of your hardware and the exact specifications of the box and monitor. as a GUI try something like ICE, and, Don't even think of running KDE or Gnome. And, stay with only 'stable' versions of apps. Make a text file of (1) your hardware specifications, (2) Distro type and version and, (3) anything else you can think of. Not only will this help you install and manage, but, you can just copy this 'when' you ask for advise on this or any other forum.
Linux is a terrific OS, but, it still requires more knowledge of the system workings and has less 'hand holding' than for the equivalent M$ product. The learning curve can be intense, but if you can handle that, it's a great experience and worth it. Good luck

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