Since Sonos doesn’t support Airplay on PCs, you will have to use a third party app to play audio from your PC to your Sonos speakers. I’m sure you can Google which apps are the best, or someone here who owns a PC can give you some suggestions.

You might be able to connect your PC’s audio out or headphone port to the aux line-in on the Five? Not a wireless solution though. Or use a Bluetooth audio transmitter and receiver if they aren’t physically close enough.