After a session of almost 5 hours, all 67000 music files were registered in the database. During that period the crashguard popped up twice with some errormessages. (BTW, pressing the button "send to Magix" was not succesfull, because the next message appreared: "errorrapport could not be sent". Internet conection is always on). In the error message my quad cpu is detected as a Pentium II. Windows cpu performance shows only one core active during MM16 activity. 
After registering all te files, Windows pops up with the message that MM16 does not work anymore... A restart of MM16 is needed. 
I decided not to do a file examin for the visioview, because this would take at least 4 days... 
Maybe MusicMaker doesnot like Windows7 and/or a quad cpu??
 

system:
pc windows 7 64 bits (classification 5.9)
Intel quad cpu 4x2.4 GHz 
memory 8GB
lots of HD space