If you have the drivers installed(hit nvidia.com for the latest), the video card fan should slow down as power management kicks in.
Please use HWmonitor or similar to see if the card is getting too hot. That fan should almost NEVER get that loud.http://www.cpuid.com/softwares/hwmonitor.html
The cpu fan thing is normal, I have some systems that do the same thing.
seen your new post.
Some users run the monitor sound and usb through a wall into the next room so they do not have to hear the computer at all. for real some do