By thinking that the application is "horrible" you are setting yourself up for failure. Please don't be so negative, you can do this! If you have a audio track that you want to delete, "ungroup it" from the video track and just select and delete it.
To add to what George said - you already have the basic knowledge and skills from using Windows Photostory and you are now moving up to a more sophisticated program - which does more and allows you to be even more creative.
Also have a read of the installed pdf manual - it is found in the Windows Start menu, Programs, Magix, Photostory (version), Documentation or something similar depending on which version of Windows you have.
I tried to go to Audio Recording: then i get a message: the selected folder is passwort protected. There is no possibility to delete the audio file (radio music which was playing in the room where I tried to set up my picture slide show) which I put in accidentally.
Where is the possibiliity inthe Photostory program for "ungroup" ?
Still, this program for me looks like the stone age in MS-DOS of software