I have an external hard drive USB 2.0 that holds my video files. I am using a relatively new HP Media Center PC that works fine. I regularly use My Computer to browse to files I need on this external drive. All of a sudden I am getting an error messsage a Data Execution Prevention error "To Help protect your computer, Windows has closed your program". If I click "CLose Message" then I lose my ability to browse. I can tell that I am not getting the thumbnails for my photos. What is going on here?