Gents, this sounds to me more like a primary power suppply issue, I was not aware there was a WIN7 USB bug. You guys (HiTech) deal with far more issues than I do, but this is one I thought I would have been aware of.
I have experience this symptom a couple times, but very rare and I only have my keyboard, mouse and Joystick using external USB connections, however my total USB connections are 8 using the System Information app. I am not sure what the other 5 connectiosn are, or if this is just showing enabled connectors, which would make sense.
My Power Supply is pretty hefty too, I think 1000W - 1200W. I cannot remember exactly. Im curious to understand this issue for it may assist me with my clients.
Thanks, PF