How should I reinit a new db (windows 8 64b)?
you would require mysql folder from the data_old directory. As it looks for mysql related tables whenever you initiate mysql on with some other folder.    Perform following steps in sequence    


  1 stop MySQL instance for old instance    
  
  2 copy data folder or system databases folders(mysql,performace_schema,information_schema,test) folder from  "D:\wamp\bin\mysql\mysql5.6.17\data_old"   to the new path " D:\wamp\bin\mysql\mysql5.6.17\data"   
  
  3 mysqld --install  --defaults-file =Absolute Path to .ini file   


If you are successful, the message “Service successfully installed.” will appear   

If so you should be able to connect to new MySQL instance with new port.

Hope it helps