Getting error when trying to copy files from USB to the laptop

Hello,
Recently I upgraded my Sony VAIO SVF1521BGXB laptop from windows 7 to windows 8.1. For that I used Kingston 64 GB USB drive.
I have formatted necessary drivers and files by using this USB. Now I have planned to move some of the movies which are located on USB to laptop Partition Drive D. But unable to copy and showing this error path not exist. What is this error indicated? I never get any type of issue with this USB before. After upgrading I faced this issue.
Is this issue related to USB or Windows 8? Can somebody help me to figure out what is the issue? Thanks a lot guys!
