Hello,
this seems as a problem of installation - it must be run with administrator rights.
You can easily fix it by running the C:\NXP\FreeMASTER 3.2\FreeMASTER\register.bat as an administrator (select the file in Windows Explorer, pull a context menu and select "Run as administrator").
If this does not help, re-start the installer also with administrator rights.
Regards,
Michal