memory stick not loading

I'll preface with the fact that I recently re-installed my operating system...i dont know if that has anything to do with this... but i am trying to back up files with a memory stick..atlantis usb removable drive.. I put it in the usb port and nothing happens.. I looked in my computer under drives and all that are there is the main and dvd... how can i get this to work? The other usb port has wrlss mouse and that is wrking and I previously used one of these before and it worked..wnt to autoplay.. not coming up this time.. please help.. thank you