Unfortunatly, not. This preview is just what it is - a preview. But there's kind of a workaround: I'm a big fan of the Zune software, and this player provides kind of a "mini-mode" that can be configured (via Settings > General) to stay always on top. This is what it looks like on my system: The nice thing about this is that you can move the video around on the screen to put it in a place where it doesn't disturb you; you cannot do so with the thumbnail preview, for example...
Thanks, but I need it to play full screen on the TV HDMI and mini mode on the PC at the same time, the TV is to the right of the room so to watch it I have to twist around from my PC, so when we're watching a film I have it on the TV so the gf can watch it, so I want a small version on the PC too so I can watch while Im browsing too