Hi davidcaughman,

Thank you for your PM earlier.

Your post is strangely robotic with neither greeting or salutation which may be putting off people from helping you. Things are a bit 'meh' with me at the moment and I am full of a cold but will do my best under the circumstances.

My assumption is that your ATV's are ATV2's and not ATV3's judging by the timescales.
On the ATV2 the setting options for audio should be Settings>Audio & Video>Dolby Digital Out either ON or OFF. If you are don't have DD decoding equipment then set this to OFF.

Your selection of movies downloaded from iTunes puzzles me because there are perhaps only 2 formats (MP4 and MOV I think) which are ATV compatible and it's possible that you may have your download settings set up wrong for iTunes because you are on PC and not Mac, although I can't say for sure because I haven't used a dark-side machine for at least 7 or 8 years.