how do i get the information about your setup? You using some kind of software I'm guessing. I'm also guessing you have some kind of monitor plugged into that computer.
so I guess you would have to have another port to plug another monitor into then configure your software to display video on that monitor once a video is played.
I'm probably not helping much.
windows does 1 of 2 things when you have another monitor.
copies (Clones) the contents of the main monitor onto the 2nd monitor
or
extends the desktop to one side of the main monitor onto the second (extra wide/tall display)
unfortunately this doesn't help things at all. So unless your software (jukebox or mame or whatever since you didn't mention) supports playing fulscreen video on a secondary monitor, you aren't going to have an easy solution.