I've been trying to sort out the best version of Linux to install in my computer (ubuntu, lubuntu,...). I have an old machine: Intel Pentium M 725 processor - 1.6Gb, 400MHz FSB, "MB L2 Cache, 60Gb HDD, 512MB DDR )
Can you help me?
Does your computer have a make and model, or is it an anonymous grey box?
Do you know which video card you have? I have a few Dell C400s which use the same type of chip and have Intel video which requires an intervention in Boot.
According to Wikipedia "the official Ubuntu Documentation recommends a 1 GHz Pentium 4 processor with 768 megabytes of RAM". That is not to say that that is necessary, but that is to get optimum performance, otherwise it may be S-L-O-W.
Xubuntu (Xfce4) is lighter, but Lubuntu (LDXE) is lightest of the Desktop Environments. Of the Windows Managers I quite like one of the lightest JWM (Joe's Windows Manger).
It has nothing to do with make/model or whatever, it's the hardware that counts here!
Best to do in your case is go for Lubuntu or Xubuntu. Both distro's are build with a desktop environment that is made for low-spec/low-memory systems. Further more i would like to recommend zRam (check the website of webupd8. Lubuntu 13.10 has zRam enable by default on low memory systems.
"It has nothing to do with make/model or whatever, it's the hardware that counts here!"
The make and the model will largely tell us what the hardware is!