I think Ubuntu or Xubuntu, last one recommended for old computers due it uses XFCE window manager.
Download a LiveCD and try it on any computer without modify your current windows installation. Just insert the CD on the cdrom (or USB flash memory) and boot from it. If this run well, then you can decide to install it.
Last Wiki Answer Submitted: January 25, 2011 2:46 pm by Mariodlg2,790 pts.