A tricky one
The installation of the EON software installs various components / programs and one of those is SQL Server.
It sounds like the Current Cost front end / part of the installation is not seeing the SQL Server component.
If you check your add / remove programs and sort by install date you can see what new items were installed on the date the Eon software was loaded.
I did try this once on a XP Netbook but as you could not resize the program windows to fit the small Netbook screen I gave up and reinstalled the laptop from scratch to remove all the components.
Automan.