This is another step with more complete things according to kind of stuff you have inside your laptop. A little bit explanation I found in a forum.

1. Choose your wireless equipment
The first step is to make sure that you have the equipment you need. As you’re looking for products in stores or on the Internet, you might notice that you can choose equipment that supports three different wireless networking technologies: 802.11a, 802.11b, and 802.11g. We recommend 802.11g, because it offers excellent performance and is compatible with almost everything.
Here is what you need to make these tips work well
Broadband Internet connection
Wireless router
A computer with built-in wireless networking support or a wireless network adapter
A wireless router
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Are you trying to make your laptop as a wifi router so that your ipod Touch could get online? Here is the way I found when I do ‘googling’.

Step by step:
You need to go to Start -> Control Panel -> Network and Sharing
Once there look in the Task sidebar there should be an option saying Manage Wireless Networks click on it.

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