Probel with Embroidery disc
I am pretty sure you can download Disk 100 free from the Husqvarna Viking website. This has all the embroideries that came free with the machine, plus the alphabets (I think!). You can download this direct to your PC or to a set of floppies, depending on what your Designer needs and what support software you have (or have not) got. If you have no Husqvarna software at all, your PC will not be able to read the floppy. It is in .shv format which PCs are unable to read, being an embroidery machine language only.
If you are trying to open the faulty disk in your Disk Manager software, I always found it worked better if I didn't put the disk in the floppy drive of the computer until after I had already opened Disk Manager.
Hope some of the above is useful to you.