I'm not sure if Partition Wizard can do it, but with Testdisk you may have the chance to copy out the lost files before writing corrections to the MBR/PBR.
Not nearly as easy to use as there's no GUI, but there's no further harm to the drive as long as you don't specify writing the corrections to the MBR/PBR.
When I'm unsure how a "fix" is going to come out I first make a raw clone of the disk. That way I can work on either the original or the clone and can always start over. If I feel relatively confident that a "fix" will work I work on the original.