Reloading ME on a HP Kayah xu800

I am having trouble reloading ME on My HP Kayak xu800
computer. I had to reformat the hardisk which I did. I
entered the start-up disk which came with ME. It goes ok
untill it gets to check reg. at this point it either locks
out or goes back to A:\ promp. I follow the directions
that came with the disk. I change the cd-drive and type
set-up but nothing happents, it dosn't reconize the disk.I
know the computer is ok because my son loaded a 2000 pro
onto the computer to check it out. The 2000 does not us a
start-up disk, it reconize the cd. Help me what am I
doing wrong. I do remember having trouble when I first
loaded ME onto the computer, but I don't remember how I
corrected the problem. I can be reach at Malnicof@(remove
this).yahoo.com

PaPa bill