Sorry to persist but it didnt work or I didnt follow it properly...!!
A fresh installation requires me to create a new admin and a new blank database where all blank tables of new installations appear...!!
My older backup taken with help of MySQL Workbench (outside the forum) is complete backup, which when imported using PhpMyAdmin restores everything using the old db name... Shouldnt that backup already have the admin and a database name where it was running last...??
Sorry but I seem to be missing some step in between...!!!
Would you pls confirm that in my situation, I would need a fresh installation to be first done, right...?? This would involve all the routine steps like creating a blank db first and running /install/index.php and it would take me thru all the steps of asking for blank db name, db server, db login, db password etc and finally would ask me to 'create' a new admin with fresh password etc...!!! Once done, I delete Install Folder and end up with a blank forum...!!!
Where do I go next from here using my backup of previous forum...??