Info on how to merge logfiles from old installation

Apologies if this has been answered before but I need some info on how to merge logfiles from a previous WD installation.

I have been running WD for several years together with WD Live, however my server became corrupted so I had to reinstall XP together with a fresh version of WD.

The new version of WD has now been running for several days and I would like to retrieve some of the data from the old installation.

I have access to the old WD logfiles etc but dont have a registry backup from the old installation.

What I really want is to be able to recreate the all time records and rainfall data going back 3 years using the old WD logfiles.

How can I merge the logfiles etc from the old WD installation into the new WD installation?

All info welcome.