I believe the entry is in HKEY_CURRENT_USER not HKEY_LOCAL_MACHINE

HKEY_CURRENT_USER\Software\Softrak Systems\Adagio Financial Reporter

I bet it is there if the Financial Reporter was ever opened on that machine.

The HelpDirectory key might be missing or pointing to the wrong folder.

It should point to C:\Softrak\Ledger in a standard install

However, on another of my machines with a full Ledger install it is in

HKEY_LOCAL_MACHINE\SOFTWARE\Softrak Systems\Adagio Financial Reporter