Camera falling down

[Obito]

Just started the game, and the camera is like falling down constantly. I cannot keep it still, it's as if my mouse were stuck at the lowest part of the screen, except it's not, because it works normal when I go to the menu.
Any way to fix this?

[plutomaniac]

If you have any gaming mouse with special utilities/programs and profiles try disabling all of these before running the game. Otherwise, do you have any other generic/older mouse to test?

[Obito]

I'm using a PS/2 mouse, with no software installed for it.
I've tried using a USB mouse instead, and camera also moves on its own.

[Obito]

I disabled all Joystick drivers that I had installed, from the Device Manager, and that fixed it.