1. Did you get any error message?
2. Have you installed any codec pack on the computer? 3. Does this issue happen only with the movies created using Fraps?
4. Does it happen when you trying to play normal movie files stored on the computer?
5. Which application do you use to play video files?
You can try to booting the computer in clean boot state that helps in identifying if any third party applications or startup items are causing the issue. If yes, you may have to contact the program manufacturer for any
updates or uninstall and re-install the program.