microsoft office xp for students

[sks]

i used the training program yesterday with no problems.
when i wanted to go back into it today, i get a message
that says "please insert disc containing the 'microsoft
office xp pro sbsi - text' syllabus into the cd-rom
drive 'e:\'." I have tried all of the discs that came
with the program, but nothing works. I also tried the
audio only, text only, and audio and text sign in. can
you help?