Hi, Just try,
It works normal for you for other folders, but not in specific folders. Just right click that folder go to properties. In the customize tab that is shown, Please choose General in the top tab, If music or picture are there . You could click the drop down box and choose.
Unusually, some programs make change in these properties, to either picture or music. So, it takes much time to read the file to delete. Try, I had one such problem and after changing this attribute, my explorer resumed normally.