Video Display issue Hoster 4.11

[Singsation]

Hi all just purchased another computer, a Acer all in one unit a Z5610, as it has no second monitor out so i purchased a iogear usb to vga adapter that supports 32bit 1024 x 768 res. All works fine with graphics but will not put video on second monitor just shows black background and the music will play. If I play a insta file and select a video all works fine and plays in perfect sync with the music and is on full display on my second monitor and on preview display. I can also play videos using windows media player and i am able to drag the video display on to the second monitor. I am using windows 7 home premium intel core duo 2.93 e7500, ati hd4570 with 512 dedicated. UAC is disabled all the last updates for windows, acer and iogear
4 gid of ddr3.
It would be a great machine to flight case and take out as its touch screen and very quick. If i can just sort the video part out.
Thanks in advance