Contacts have been deleted of mt emclient

first set eM client everything worked very good all folders tranfered ok including all contacts on both my email accounts used them for hours then closed of emclient re opened it up no cotact in any of contact folders spent hours trying to recover contact without any look gone through all suggestions on & in help even tried to convert cvs file to exl as stated within emclient import window really like emclint 7 would like this issue resoleved please
note i am not very up on computor programing please if you can help do it in way a beginer can understand thanks for any help des