cannot see video on pc

After upgrading my new iPad (iPad 3) to iOS 6 I can no longer see videos I made with the iPad camera on my PC. I transferred the .mov file in different ways, but Quicktime on my Vista or Windows 7 PC refuses to show the video. The audio plays fine.

VLC player does show the video, albeit tilted 90 degrees. Videos taken from the iPad before the iOS upgrad play perfectly, even if they are transferred after the upgrade.

Uploading to YouTube makes things visible again, I just can't get it to show on my Windows PCs. Is there a new war between Apple and Microsoft going on?