I struggled for days getting my Iogear GDU421 bluetooth adapter to work under Windows 7 until I found this software.  I had tried both the Iogear and Broadcom software, but both failed to work on Win 7 x64.  Fortunately for me I found this website while searching for solutions on other bluetooth forums.  I installed it and it worked with my Sennheiser MM400 A2DP headphones  first time, immediately and effortlessly.  Not choppy, no hesitation, doesn't take very long to connect either.  I highly recommend this software.