ok, try this...
Run Videobox, and when it has loaded and you see it on the taskbar...
Press ctr-alt-delete on your keyboard, and select 'Start Task Manager'
in Task Manager, select the 'Applications' tab near the top and then right click on Videobox below, then from the menu that opens select 'Maximize', that may sort it!, if not try again and select 'bring to front' instead.
Try that and tell me the result...