The most common reaction is to blame the camera. Next in line is the computer. It's actually no one's fault. Most computers don't come fully equipped with video handling. Windows(R) does not come installed with all the codecs needed to run all video formats.
To solve this, look at the video file from your camera. Take note of the extension. It can be .avi, .mov, .mpeg, or something else. Search the internet for the codec of that file. Install the codec into your computer. Reboot then try to play the video again. Most often, it will work. Sometimes, it won't. You'll just have to find another codec source again.
If you know exactly which codec the video and the audio uses, it will be much easier for you to get exactly what you need.
If you aren't successful in installing the right codec to run the video in the computer, download VLC Media Player. It's freeware and carries its own codecs. Very few media files aren't recognized by it. There is a drawback though. You still won't be able to view your video with other software aside from VLC.
If everything fails, there is one more thing to consider. Upgrade your computer's memory, video card, hard disk or the entire computer itself.
Now you know!