dozens of hours of lost work here.
Sorry to read that.
Did kaspersky really erase the .txt files that DW uses for storing pages ? and the images, pdf and oher media you use ?
If so, in case kaspersky did not overwrite (I think the windows word is
shred) files, but simply removed them, you could try some unerase tool. I'm not a windows user myself, so I can't help, and this forum is not the right place for this anyway, but I'm sure you can find some tools to make a raw disk image of your stick, then, once this backup is safe (2 copies, different media, somewhere kaspersky can't touch it), try various unerase software on your key.