So i installed the game and everything works great except for one thing: when I use slow fine movements on the mouse, the cursor doesn't move at all in game. And it's really annoying.
It means that if i stop the cursor close to a target but not quite on it, I have to jerk the mouse so it moves, and then target the enemy again.
Does anyone else have this problem?

As for my system:
phenom 2 x4 945
4 gb ddr3
ati radeon hd 5850

The mouse is a logitech g500. Could that be the problem?

I actually figured it out. It was because of the mouse acceleration. It seems the game has an issue with that. Once I turned it off everything went well.