Thanks, when it happened the first time I tried VLC and that didn't work. I've also tried the folder options and that didn't work either. The files are Quicktime Movie files, as are many others that open fine. I also have MP4 files that all open and play fine. The only thing that worked was...
A couple of months ago I had an issue with Windows Explorer crashing when I tried to open the Videos folder. After much research and help from other forums it turned out to be a dodgy windows update, KB297519. Once this was manually removed I was able to access my videos folder again and the...