well, either your OS 1.71 is corrupt (unlikely, otherwise the MPC probably would not boot up in the first place - however it is worth re-installing the OS), or the .AKM files are corrupt (more likely, if they are from a 3rd party)
Can you save a Multi from your own MPC4000 onto its own hard drive, and then load that back up?
Thanks for your time. The OS has been re-installed and the files are from the original cd. And no t will not load multis that I saved on the hard drive, but will load programs/sampes/seqences etc.
that is a bizarre scenario previously unknown to science. I can't think of anything to suggest, other than you must be doing some really simple thing completely wrong