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DanceHans, does the problem persist when you install the most recent WHQL-certified drivers?
From other topic on similar problem:
Found this on the developer's website:
"Users of certain graphics cards may experience minor problems with the mouse pointer. In most cases these problems can be avoided by selecting to use a basic in-game mouse pointer. To use the basic in-game mouse pointer, follow these steps:
1. Via the main menu or pause menu, select "Options"
2. Using the options category tabs at the top of the screen, navigate to the
display section by clicking on "Display"
3. Disable the "Enhanced Cursor" (so that no tick appears in the box)"