I have a problem with my new phone

[Adry.]

            Hello , forum !

   So , a few days ago I brought a new phone , a Samsung Galaxy Express II . Everything went great with it , exept when i wanted to transfer some filesfrom  my PC to it via a USB Cable . I connected the phone , selected the MTP thingy on the phone and it showed up in My Computer . then i proceeded into the Card folder and dragged the files inside it .

 

    And this thing lasts forever and ever and if i hit the close button it says (Not Responding)

 

I also installed Kies 3 , thinking that it might solve this problem , only thinking , it didnt change anything.

 

I am looking forward into finding what is the problem with it or getting some suggestions on some good apps that whould let me copy my files on the phone/sdcard(not Dropbox , Google Drive , OneDrive etc.)