Use Wi-Fi with Windows
If your Mac is already connected to the Internet wirelessly, by default Windows is also set to access the Internet wirelessly, with no setup required.
If you change your network setup, you can reconfigure a Wi-Fi connection using the Bridged Ethernet mode, When operating in this mode, Windows appears on the network as a stand-alone computer with its own IP address and network name.
To configure Windows to access the Internet through Wi-Fi:
After you perform these steps, Windows is able to connect to the Internet through the AirPort adapter of your Mac.
If you can't configure your virtual machine to function in the Bridged Ethernet mode, consider using Shared Networking or Host-Only Networking.
For the information about troubleshooting networking problems, refer to the Parallels knowledge base available at the Parallels website.