SegaXtreme

I am installing XP Professional on an Optima desktop PC with a Celeron D processor. I am getting as far as the 'Installing XP' stage and it soon comes up with a fatal error message which says 'Manifest Parse Error: Invalid at the top level of the document'. This error is preventing me from going any further with the install. I am installing it of a copied CD as I do not have access to the original. Can anyone help me out with this?