Problem Creating bootable windows xp cd

Hello, i am rupesh here telling you that- i have got a cd of windows xp, i wanted to make a copy of it, so i firstly copied all the contents of cd then i burned it on a blank disk using free easy burner, after that the problem is that the cd is not capable to boot. I looked that all the files are as same as the real one. Please tell me what was my problem <windows xp sp2