I'm assuming this question has something to do with your previous thread.
I first suggest you check and see if your computer already has a built-in wireless receiver. You can do this by following these steps:
1) click on the "Start" menu at the bottom of your screen.
2) click on the "system" icon in the new window.
3) open the "hardware" tab at the top of the window.
4) click on the button that says "device manager".
5) click the "+" sign next to "network adapters".
6) You will probably find a short list of network adapters, including the "ethernet adapter". If there is one that says something like "wireless network adapter", then you already have a wireless receiver built into your computer.