Wireless Adapters

Question

I want to connect a Yamaha Clavinova Digital Piano wirelessly to the internet. I purchased a Belkin Router and USB Wireless Adapter, (Models F5D7632-4 and F5D7050). The Router seems to work but the Adapter is not accepted by the Clavinova. Yamaha appear to recommend the Belkin F5D7330 or F5D6050. Before wasting more money on this can someone tell me what the difference is between these various adapters and why manufacturers don't seem to make these differences clear. ThanksNeil Ogg