To determine the cause of the malfunction signal Wi-Fi you need to find out whether a netbook to take this signal. This implies a few cases. As you know, in order for a device can make Wi-Fi signal, it should have the appropriate receiver of this signal. If that is not in the netbook, then transfer data wirelessly impossible.
Open control panel, OS your netbook and go to "device Manager". A window will open listing all the devices netbook. Look at the bottom of the list a group of devices called "Network adapters" and click the triangle that deploy the equipment list in the group. Among all the installed network adapters, find the adapter, having in its name the word "Wireless". If such a device is available and a line that displays it in the list, marked in yellow, your netbook is able to receive Wi-Fi signals. If the device is not listed, it means that your netbook is not able to accept the Wi-Fi signal. The only way out of this situation is the acquisition of an external receiver that connects to the netbook via the USB port.
If the hardware receiver in the device Manager marked with a yellow color, then the receiver is not working. Right click on the line with this device opens the context menu. Determine whether the list options menu "Enable". If there is, click on it, and the receiver turns on. Next is to check the performance of the device. If the item "Enable," no, you will need to install the drivers hardware Wi-Fi receiver. To do this, you must first download these drivers from the Internet. To date, all manufacturers of computer equipment post drivers to produce their devices on their official websites. Go to the website of the manufacturer of your netbook and download the drivers for the network adapter Wireless. You can then proceed to the installation of this equipment, click "Install driver" in the Properties section of the equipment. Next, the installation wizard prompts you for the path to the location of the previously downloaded drivers and install them. After the installation procedure is to reboot the computer and test the Wi-Fi receiver, trying to connect to a local network.