1. Check to ensure the laptop is within range of the router's wireless signal.
2. Restart or reboot the laptop.
3. Ensure the wireless network is broadcasting a signal.
4. Check that the driver is up-to-date.
5. Try a different wireless network.
6. Restore your laptop using the system’s Restore Point.
7. Try temporarily disabling the laptop’s firewall.
8. Contact your router’s technical support team, or manufacturer.