I made a query in a private MS forum, this was the first response:

"Installed the Beta (Office 2003 Professional) and it did nothing to
affect MapPoint 2002 on this computer (nor any other program). Suspect
his problem is elsewhere. Did he perhaps have an AV program running
during the install? That's almost an absolute guarantee of a flawed
install."

Also, I checked with the lead support person for MapPoint for MS who has personally not had a problem or heard of any problems of this sort.