might be to back up the Thumbs folder within the ddisoftware folder and copy that back. Would that work?
It sounds like you have a backup of the photos and the Qimage folders.
All you would need to do is copy the Thumbs folder back into the Qimage folder, and you might as well copy all the sub folders (Crop, cutouts, filters, save etc.) and you'll keep all of your Jobs and printer settings etc.
It might be a wise move to make an image backup of your drive from now on.. I do this every night. Takes 15 minutes.
If I get a virus, I Restore the backup made before the virus arrived.
Same goes for a new hard drive.
I install the drive, and restore a backup file.
Fred