Yeah, thats what it has to be I even went as far as searching for broadcom driver fixes for vista, tried 4 or 5 differnt drivers, they all worked, just not properly. I have it on my desktop that is wired and works awsome! A few minor glitches like the audio but I use it for photoshop only my laptop is internet and music so its working great....
other known issues that I found are alot of the photoshop plugins that work with photoshop cs4 on xp and vista dont work on windows 7 mainly the autofx and onone plugin suites