Opening encryption files from Vista backed up in Norton 360

I would be glad of some assistance.

I have recently upgraded my OS from Windows Vista to Windows 7 Ultimate.

My Windows Vista data was fully backed up by Norton 360.

I did not use the backup in downloading Windows 7 Ultimate.

Now I cannopt open my .uea encrypted files.

How can I get the encrption key from Norton 360, without restoring the whole system backup?

When I look at the backup files they don't tell me anything.

Thanks, anyone?

ColinD44