Retrieving Reg data from Ghost BU

2 laptops running XP PRO:
Old laptop stolen but I have a Ghost BU of complete HDD.
Installed a program on NEW laptop in the same partition & folder as it
was installed on OLD laptop.
I need to get some Registry keys from the OLD laptop
(HKey_Current_User\Software\Name of Program) to install into Registry of
new laptop that will show my personal settings for this software ( and
save me about a day of setting up things)

I also have a Registry backup from using ERUNT.

Any hints as t how to go about this??

TIA
Doug