There is no data problem

Hy

So...i?m playing ps1 games wich are not iso and are located in game folder...and just all of a sudden i tried to play and it showed me there is no data although my memory stick is almost full.same for the saved files folder...my version is 6.0 and the rest i dont know xD...I formated my memory stick twice and restored default settings.and there is another problem.when u press select it shows you a menu in wich you can conf some settings.that also dissappeard when i formated my memory stick. PLEASE HELP!!!