This detailed guide shows you how to dual boot Ubuntu with Windows legacy BIOS systems. If you are not sure, read this to know if you have BIOS or UEFI system.
Continuing my experimentation with different Linux distribution, I installed Xubuntu last week. Xubuntu is a variant of Ubuntu with Xfce desktop environment instead of the default Unity. Light on resources, Xubuntu can be a good Linux alternative of Windows XP.