If you want to take advantage of public WiFi hot spots or your own home-based network, the first thing you'll need to do is make sure your computer has the right gear. Most new laptops and many new desktop computers come with built-in wireless transmitters. If your computer isn't already equipped, you can buy a wireless adapter that plugs into the PC card slot or USB port. Desktop computers can use USB adapters, or you can buy an adapter that plugs into the PCI slot inside the computer's case. Once you've installed a wireless adapter and the drivers that allow it to operate, your computer should be able to automatically discover existing networks. If you have an older computer, you may need to use a software program to detect and connect to a wireless network.
When your PC cannot connect to a wireless network, which of the following cannot help you to address the problem?