Just to check,
1)You are wanting to run your computer to your TV.
In the back of your computer you have is the VGA monitor output.
2)What would be helpful, the make of the computer you have (I'm guessing it's an off the shelf)
3)What type of inputs does your TV have (S-Video, Component (The red Blue Green), DVI, HDMI, Cable, or Composite(Yellow, Red, White)
4)What is the general purpose of what you are trying to do. Watch movies off a DVD, Video Editing, Streaming video, or just a big picture of Word.