When you insert your drive in the computer generally you will get a prompt that will ask you what you wanna do. When this happens select "open folder to view items" after that a window will open with what is inside your drive. If this doesn't happen go to "My Computer" and select your flash drive to open it. After that find where your videos are stored and drag and drop them inside that window.
To play them open up your drive and double click what you wanna play.