Open Device Manager , expand Bluetooth Radios , and look for a manufacturer name like Broadcom (Widcomm) , Intel , or CSR .
A2DP stands for . It’s the Bluetooth protocol that allows high-quality stereo music to stream to your headphones. Without it, Windows 7 defaults to the "Hands-Free" profile (HFP/HSP), which sounds like you’re listening to music through a walkie-talkie. a2dp failed to load stereo audio windows 7