Having a similar problem.
The videos I made on my Photosmart camera download, burn and play just fine.
The videos my daughter made on a Pentax Optio camera download to Photosmart. The photos I also downloaded burn onto a cd and are fine, but the videos I burn have audio but black screens. I also cannot download them to Photobucket, although mine download fine.
What extra step do I need to make an AVI video from Pentax show when it's replayed from a CD? I can view it on my computer just fine, but not after I've burned it using CDburnerXP.
Running Windows XP.
Remember I'm not technically inclined or profficient, so I need answers in plain English. LOL
Thanks.