The horrible "mouse in the top left corner-problem"

[Emerald]

I did a search here on the forum, but I never saw any solution to this problem (the cursor gets locked in the top left corner, and stays there untill you exit the game).
I saw a post where a guy had found a solution to the problem, but he never posted the solution.

Do the developers have the solution to this problem? Does anyone have the solution to this problem?

I bought the game though Steam today, and it has also happened with other games (like Red Faction: Guerilla).

I hope someone has the solution, and thanks in advance, guys!