1. We haven't experienced that error on Win7--in fact, the driver has simply worked with all the Win7, Vista, and XP systems we tried it with. All I can think is try to reinstall the driver, try it on another system, and let us know if it doesn't work. We'll also see what C-Media has to say about it.
2. A tiny amount of transformer hum can be normal (ear to chassis kind of thing), but I've never said excessive hum is normal--in fact, in the 6Moons review, I said we contacted the transformer manufacturer and changed the process to eliminate the hum, or at least dramatically reduce it. Which was done in 2010.
Hope this helps a bit.
All the best,
Edited by Jason Stoddard - 10/31/11 at 11:20pm