Hi,
I can't comment on v6, but it seems you are in the right vicinity.
In v7 the database is here by default, at least that is how it is on my system.
C:\Users\Public\Documents\Softouch\Easyworship\Default\v6.1\Databases\Data\Songs.db
I have just tried re-importing my EW7 database and using 'C:\Users\Public\Documents\Softouch\Easyworship\Default\v6.1\Databases\Data' as the directory works, so I imagine something like what you were using should work for EW6.
If you want to make sure nothing gets damaged, make a backup of the Softouch folder and everything in it before fiddling, or use the backup/transfer tool from EasyWorship that is available from here
You might also want to upgrade to the latest version of EW6 that is available here
Also make sure you have the latest version of OpenLP.
At a very last resort, you could download a trial version of EW7 from here and import your EW6 database, then try again, though I think that is a long shot and should definitely only be done after a full backup of your data by copying the Softouch directory or using the profile backup/transfer tool, or both preferably - if backup space is limited you can avoid copying the 'resources' folder that will often be full of videos and PowerPoint files, and I think the transfer tool has an option to not transfer these too. I am not absolutely sure, but I believe you can have EW6 and EW7 operating side by side (I think I have done this before) as I think EW7 will upgrade the data files to a new directory, but having the backup is essential in any case.