If it is not too private, could you attach the reg key to a post for examination?
Before that, You may need to take ownership of the key. Open the attached zip file and run" Take ownership" Now, when you right click a file or folde
r, you will find an option to "take ownership" . Click this for you reg file, and then try to import it again.
Uusal warning - Make a backup of your registry before doing so!