Norton Save and Restore 2.0 Mount Recovery Point asks to Format Disk

Hi, I hope someone can assist?

 

I have Vista and have tried to mount a recovery point to explore it and once mounted, I am prompted "to format the disk before I can use it"

 

If I cancel and access the new local drive from My Computer or Explorer, I get the same message.

 

What is causing this and how can I prevent it so that I can explore the recovery point? The C: drive is NTFS and the backup has been done to an NTFS external USB 1TB drive.

 

Thx in advance of a reply