Difficulties Bootcamping Windows XP

I just upgraded to a 1 TB HD on my early 2009 Mac Mini. On my previous HD, I had Bootcamped Windows XP which is the only OS that runs an ancient program that I use to back up my equally ancient Sharp Zaurus PDA. I'd like to maintain this ability but my newly upgraded Mac Mini will not even accept the original Windows XP Professional installation disc, instead ejecting it after a minute or so without recognizing it in the Finder. I'd be very grateful for anyone's helpful ideas. Thank you.