Disklavier

Hello, It's been so long since I've been here. I've got a Mark 4 Pro.
Using an IBM Windows98 with PowerTracks v11. I've had this piano for
maybe five years. I seem to have everything operating except when I
put a disk into the piano and press play, it doesn't register as
playing on the computer software. Everything else works like; when I
play something on the computer, it plays on the piano and when I play
something by hand on the piano, it plays on the computer. It's just
when I stick a disk into the piano and press play, the disk doesn't
play on the computer. It doesn't show up in the software program. This
is agravating becasue I have written a lot of music onto disks over
the years. Now I want to edit the scores but can't because I can't
seem to get the music from the disc into my computer software. I am
now wondering if this is even possible. I also have a laptop with XP
if that helps. It's not hooked up but I had it hooked up last week.
Maybe that would help? Also is there a book that I can purchase that
will explain hoooking up the piano in detail to the computer. I've got
the origianl manuals but I can't make heads or tails out of the
instructions. I know from the past, there are a lot of very
knowledgeable people in this group. Maybe one of them can help? Thanks
so much!!