If the wireless capability is not working on your Lenovo G575, first check if the Wi-Fi is enabled using the physical switch or function keys (usually Fn + F5). Ensure that the correct drivers are installed by visiting the Lenovo support website to download the latest wireless drivers. Additionally, check the device manager for any errors and try resetting the network settings. If the issue persists, consider running the Windows network troubleshooter for further diagnostics.