Q: itunes crashes when selecting AV Receiver on Airplay

I have just bought a Yamaha RX677 AV Receiver. When I select the Airplay icon in iTunes on my Windows 7 Laptop. Itunes crashes.

My iTunes library is on a NAS and I have over 30,000 songs. Could this be why it's struggling?

I don't know if it's crashing trying to connect to the Receiver, or whether it's crashing trying access the music on the NAS...

Could anyone help?

Thanks!

Simon