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Screen adapter?
Is your video card output vga or dvi. They do make splitter cables to go from one output to two but not one to four. If you use a splitter cable you will see a big difference in resolution. Your best bet is an Amplifier. I have used these before with great results. They are a bit pricey though. http://www.kvm-switches-online.com/video-splitters.html best bet is to buy a new video card.
or if you didn't want them to all show the same thing