Recovering Mysql - how to get a dumpfile from wampserver and none running db

I had the following: - Wampserver/mysql/drupal + batch file with auto backup by use of mysqldump. - Backup was distributed off and online.

then : my laptop was stolen :-( and I need to recover but... the size of the backup is zero bites aahhhhh. I have a good mysqldump until 20/09/2014

In need to have a mysqldump until 19/12/2014 and this is still available in database in the wampfolder. I needed to re-install wamp so I have two folders now:

d:\wamp with the new wampserver d:\wamp_old with the old wampserver with the database until 19/12/2104.

How to get a dumpfile from the none running db?

Y