While this answer seems the most logical.. I ask do you play DVDS on the PC?
Any mpeg2 codec should enable playback of the Sonys video files ( which are mpeg2)
As suggested install a video editing software ( even trial version of say Sony Vegas or Vegas Movie studio. In many cases later uninstalling them doesn't them remove the codec
Gom Player
or
VLC
Both free play almost everything and seem fo install codecs on the PC as well