try updating the Quick time on your Windows PC
Regarding the quality in Premiere Elements, do the MOV files have the correct dimensions?
For example, you expect 1920x1080 but are actually getting 1620x1080. That can happen if you forgot to unlock the aspect ratio during conversion on the MAC. You type in 1920 for horizontal width and then type in 1080 for vertical height, but don't see that the horizontal width was automatically adjusted to 1620. And off you go. That can make the video look bad in Premiere Elements, although it shouldn't affect whether you can view the files in the Organizer.
The MOV files shouldn't play back in Windows Media Player on a PC (at least on my system they don't), unless you have installed a codec pack or another application has been installed that installed a quicktime codec that allows playing MOV files in Windows Media Player.
When you are in Windows Explorer with the view set to Thumbnails, if you don't get a thumbnail image for the MOV files, you might be able to fix it with the Codec Tweak Tool. After installing and running it, click on the Thumbnail button and select the MOV option if it isn't selected. http://www.videohelp.com/tools/Codec_Tweak_Tool. I'm not sure that will have any effect on the view in the Organizer, but it's worth a shot.
Thank you ...
But maybe I should put my question in another way:
What codec/format would you advice me to convert my Apple Intermediate Codec-footage from iMovie to?