I think you'll find if you replace the PSU with a non-corsair one it'll go away. If you RMA it (and they will accept it for RMA, I've done it twice for the same thing) you'll probably end up with the same problem.
Replacing the mouse may solve the problem for that particular game, but there are others (specifically Crysis and Warhead) where it'll probably pop up on loading screens regardless of mouse.
It's something about the combination of Corsair PSUs, nVidia cards and Logitech laser mice. It'll happen with other builds, but usually two out of the three are present. The bummer for me is that they're my three favorite companies lol...