I want to use .mov files on a pc

I'm trying to play movie files I've created in Final Cut on PowerPoint in a PC. I've used Compressor to create different sizes of the movies, and iSkysoft Video Converter to make mpeg and wmv files. However, when I actually get the files to a PC, problems develop. A "Medialooks" watermark shows up on the video, and though the video plays correctly once or twice, now the screen simply goes white, no matter what format we use.

Any suggestions on a fool-proof way of getting a PC to play what we've created on a Mac? This will be for distribution to several users.

Thanks for any ideas.