Normally the entries DigaSystem stores inside the Windows Registry are placed at HKLM \ SOFTWARE \ DAVID
If you are running a 64 Bit Operating System like Windows 7 this path is changed.
For example the paths to the parameter files are stored under
HKEY_LOCAL_MACHINE \ SOFTWARE \ Wow6432Node \ DAVID \ Registry
Please note that if you exported the Windows Registry of a 32 Bit OS to a file you would need to rename the keys before importing it under a 64 Bit OS.