I am thinking about purchasing them, but I have a question.  I am playing on computer screen and using VGA cables.

Now I have the red cord from the VGA cables connected to the small cylinder thing and on the other side is the speaker cable (greenish) to get my Xbox sound to my computer speakers. 

Where would I plug in the X1's to get game sound?

The x1's come with an adapter. Unplug the red and white rca cables, plug the x1 adapter into there, then plug the xbox rca cables into the x1 adapter.

I guess you are using a monitor with no computer hooked to it?

http://www.turtlebeach.com/Portals/0/images/Products/EF_X1/diagrams/x1manual.pdf

Diagram shows the hook ups.

Thanks for the diagram, but I am still confused.

So it comes with a greenish card that plugs into the green hole on my soundcard in the back of my computer.

I have VGA cables so those go where? and why does something need to be in my computer if im not using it just my speakers?

I remember going through something similar when hooking up my x1's and my xbox hooked up with hdmi.  I nearly bought a ht system to solve it and forgot about the audio out on the back of the tv.

For your situation, I am drawing a blank.

What type of monitor are you using?  Does it have integrated speakers? no audio out jacks?