New computer dual monitor not responding

I was just wondering what may be causing this issue:
I connected our computer to the front and back projector of a church and the dual set up seems ok, however when I try to play a video ( VLC using this set up: http://superuser.com/questions/87436...tor-on-windows)
nothing happens everything still only showing in the main monitor, does anyone knows why?
Again I can see in my main monitor the desktop and wallpaper in the projectors not problem but when I play something in the VLC to play in the second monitor nothing happens, am I missing something, please help.

Computer is:
http://www.futureshop.ca/en-CA/produ...ef1a17a0fben02
Connected this way:
from comp to monitor DVI
from computer to splitter:
VGA
from Splitter to projectors
VGA
Thanks again

Hold down the windows key and press P, wait ten seconds, do the same again, etc. until it shows up on the projector. If this does not work, let me know.

If you have it in extended mode, you also need to drag the VLC player to the other screen (typically, to the right on your main monitor until it goes off the screen), then when it is mostly on the second screen, hit the F key (for full screen). Hit the F key again to make it a smaller screen again.

Thank you for the response, I'm tending towards this is a resolution issuebut not sure, the bad thing is that I'm not a comp. sabby.

Any ideas?