Ibm thinkpad 600e asks for the instalation disks for win xp but i dont have them...

[Liam :P]

Ok, my ibm thinkpad 600e i know its old but asks for the windows xp instalation disks. I dont have them. I would like to do a fresh install of ubuntu instead but im not sure i burnt it onto a cd but it never works i get the "the incorect disk is inserted" or something like that. I have replaced the small second battery that was a 3v 2028 (yes i know what a odd size). Any idea's on how to install ubuntu onto it?