Need to know how to get files

Question

I need to know how to get my files from my sim card for a boost phone to come to my computer from a Digital Concepts 51-in-1 Card Reader/Writer. Everytime I try and I plug it in and then I pull up My Computer and Click on all the removeable drives it says I need to enter a disk even after I insert my sim card into the slot that says sim card. How do i get my pictures from this sim card to my computer