I connected my HTC One to a Win7 laptop with the USB cable. Normal Win7 dialogue box pops up. I use Transfer Pics and Video to move files from my HTC One. All files were transferred. Unfortunately I was a trusting idiot and files were deleted from phone during transfer. My pictures are fine but the .mp4 files will not play using Windows Media Player 12.0.7601.18150 or Quicktime Player 7.7.4. Out of desperation I even tried iTunes player. None work. Media Player simply states "WMP encountered a problem while playing the file". QuickTime displays a black screen with no sound or picture but progress bar moves along the bottom until end. Contacted HTC One Chat Help and they essentially told me to Go Fish for an mp4 converter in the ocean of MALWARE where these converters exist. Has anyone run into this problem or have any suggestions about how I can recover these very precious Holiday videos..