Ok... You don't mention what connections you have on the back of your TV, nor do you say where this cable is designed to connect on your laptop. Now if it connects to the standard external monitor connector on the laptop, then unless you have an HDTV, you probably do not have the cable you need to make the connection. Also, if your TV only has the old standard of the RCA style red, yellow, white connectors then you will probably not be able to connect them.
You may need to go to your local electronics shop and see if they have a 'scan converter box' for sale. This is a box that you would connect to your computer's external monitor port, and the cable or component (RCA) input jacks on your TV.
I'm afraid you have chosen to attempt something that is not so easy as you'd think it should be, as the monitor on your laptop actually has a much higher resolution than your tv, unless your TV is HD. Unless your laptop is quite old, the resolution on your LCD monitor is usually going to be 1280x800 (assuming it's widescreen) or higher, and even a 780p HDTV is only about equivalent to that resolution, so anything less is going to be much lower resolution than your laptop. This means that the signal coming from your laptop will need to be downgraded to match your TV's resolution unless you have HD, and that's where the scan converter box would come in.
Best of luck, and I hope you get things worked out...

You may not have correct driver installed into your system, You should scan your computer for hardware driver from driverguide.com then upgrade your driver, Hope the answer of the question, Best of luck in future

If your TV has a 15-pin d-sub input it is ready to display computer output. You would need a 15-pin to 15-pin cable however.

If not you can use a VGA to composite converter. As others have said, the VGA output is usually at a much higher resolution than a normal NTSC TV can display so you will lose some video information. In particular small text will be hard to read.

---} You can get one such converter here {---

Go to a store and buy a laptop