Thanks to everyone's help, I managed to find the majority of the videos that I lost from my camera.
However, now whenever I try to open them I get this message:
"Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file."
I managed to open 2 of them, but they only play as audio files, despite saying that they are movie types.
When I hover over the icons they display the size, which should be correct for the length of the videos.
Is there anything else I can do to get the visuals, or at least the audio files for the rest of the clips please?