To set up wireless Internet on a desktop PC, first ensure you have a broadband Internet connection and a wireless router. Set up the Internet connection, and position the router where it has minimal interference. Consult the manual that came with the router for instructions on how you should change the user name and password from the default.
Next, on your PC, open Device Manager, double-click Network Adapters, and check whether a wireless network adapter is listed. If the adapter isn't on the list, purchase and install an internal or external wireless network adapter that is compatible with your computer.
If your PC is running Windows 7, open the Network and Sharing Center, click Set Up a New Connection or Network, click Set Up a New Network, and then click Next. Follow the wizard through the process of creating your network. Depending on the make of your router, you may be offered security key options such as WPA and WEP during the setup process. Once you're through with the wizard, the wireless network is ready for Wi-Fi-enabled devices.
To connect to the network from the PC, click the network icon in the notification area, identify your network from the list of networks that appears, and click Connect. Enter your wireless security key, and click Next to complete the connection.