How can we install sound card in my laptop ?

You cant physically install a soundcard as in a desktop soundcard into a laptop. The nearest thing you can get to one, is an external soundcard that conencts through a USB or the like. Such as this one here : http://www.maplin.co.uk/Module.aspx?ModuleNo=97120 :
This is basically a sound card that attaches to your PC/Laptop with a USB cable.

How can we install sound card in my laptop ?

Hello,
When you buy a sound card they provide the install CD.so simple.
Thanks

How can we install sound card in my laptop ?

Not enough information........good help can only be gained from great information!

What sort of laptop?
What sort of soundcard?
etc, etc

Chances are that your laptop is already equipped with some basic soundcard and speakers. It may be that all you need to do is to reinstall the drivers.

Not enough information........good help can only be gained from great information!

What sort of laptop?
What sort of soundcard?
etc, etc

sort of laptop: desktop's are a lot cheaper and more powerful. You should get a mac mini, they are so fast and small.