When the machine gets old and becomes useless. You get short on options. You can't sell it because you are so emotionally attached to it and it doesn't worth that much and you can't run new applications on it because it can't afford them. But you can turn it into a beautiful workstation. Able to open your pdf documents, play your music and videos and does your office tasks... You need just a light operating system that doesn't consume much hardware resources.
I'm talking about a Linux system of course so you won't spend any dime on proprietary software and you can avoid the headaches of the anti-viruses and etc...
The choice was : xubuntu .
Intel Pentium III 750 MHz
64 MB Ram
20 Go hard disk
Pathetic isn't it ? But it was all I had when I needed a Linux system for my SHELL programming courses. I downloaded the Xubuntu which is an ubuntu distribution designed for low performance machines and it was just perfect. The graphics were nice and simple. Most of the applications run properly. The execution of the system in the start up doesn't take much time.
You can see down here the "system monitor" and how xubuntu is using the ressources of the machine.