I have a Creative Tactic 3D Sigma headset. which attaches via USB. it comes with own driver, no mic boost in Creative software
First, those instructions does not seem like it's for windows 7, I've seen those exact instructions everywhere
Second, what you said up there is pretty much the basic, most obvious way to look for mic boost. It's not there. it's empty. I've tried. There is a volume slider for 0-100 but it does not have the 0-30 boost that can be found when i plug into a 3.5mm plug.