I wanted to show you how I deleted the non functional VST instruments from the Vita menu.

open File Explore and in the address bar go to D:\ProgramData\MAGIX\Music Maker 2016 Premium\FX-preset\FXBStore\150#§§ Vita Solo Instruments. Change letter of driver for where your music maker is.

Then start deleting instruments that you have uninstalled or don't work.

Nice and clean after you restart Music Maker 😀