If you are receiving an error message related with video conversion, you may be missing a codec or have conflicting codecs on your computer. This is likely if you are using older version of Windows. You will need to identify what codec is missing or corrupt and fix it. Just Google 'Windows Essentials Media Codec Pack' and you should be able to find some results. However we do not recommend, we do not endorse and we are not responsible for a particular codec pack.