And you are not the only one. I suffer from tinnitus and believe this is terrible. It's a manufacturer defect, I have the Latin version hp-cw005la and I almost feel like a pilot that an engine instead of a laptop fan. Oh yes, and it's not only Windows. I've use Ubuntu on this and got the same engine airplane sound. Last time I bought laptops from hp ever!
I've tried all the things that HP reps have suggested, I had a rep remote in and change the bios... nothing worked so they said basically the same thing, there was a problem with the hardware and to send it in for repair. It was less than 30 days old so I and just exchanged it for a new one. (Same model, and so time consumeing!) it wasn't a solution. I have the same exact horrible fan noise. The issue is with this laptop's configuration, it is defective. HP should earn some respect by owning the problem. I too am beginning to have a serious constant whine in my left ear... is all this worth it for a laptop? Especially one we're sending to kids going off to college?