I'm sorry to hear of the loss. Did Norton create a new C Drive that uses up all the space that C & G had? If so, try limiting the use of the computer until you do find a recovery tool or two to make sure that Windows doesn't overwrite the existing data (i.e. the area of the disk that G drive was on).
If you do get things up and running again, I'd recommend switching to Acronis TrueImage instead of Norton. It can do all the things that Norton can, but if you loose the boot-time recovery disk, you can simply burn another one. Also, it stores the backup files on a partition unaccessible to Windows, preventing viruses or uninformed users from tampering with the images.
Hope this helps, and good luck.
