Hello,
If you could check out the date of two of the files on your system it will better help us address this issue.
If you can go to the folder C:\bb\Soloists and look for the file RPno0232.ST2. If you can tell us the Date Modified for this file it will help us out.
If you don't run Band-in-a-Box from your internal drive and only run it from the external drive than instead of C: the 'C' will be replaced by which ever letter your external drive is.
Thanks,
Dave