Hi all I have a list of about 50 video sites that I want to embed my videos into ( from my video site ) and I am looking for a PC based software that I can input in login information for all sites ( once ) and then enter each video manually and attach the thumbnail and it will embed to all sites automatically CAN ANYONE HELP !

Your videos "embedded" into another person's site won't go.
First if they are your videos and you have the right's to distribute then you need to release them under some form of licensing I would suggest Creative commons if you want to get them out there and seen. If it is not your work you need to pull it down until whe you obtain permission to display and distribute it.

You will have to submit the videos through the channels provided by the site's manager. Site owners will reserve the right to review and to control what is show on their sites. Working from a YouTube channel helps.If you want to control your video keep it off the net once it is hosted for download or streaming it is available to anyone. I even use YouTube to host my videos shown on my site, it saves bandwidth on my domain and makes them easier to find.