Well, there are a number of things you could do.
--> Check if your Display settings, resolution is right. Even if it is right according to you, change it and see if a higher 9or lower) resolution is makeing any difference.
--> Change the theme (basically the icon theme) and see if that wierd line is under all the mouse pointers.
--> Maybe you have not installed the right drivers. Try installing the drivers again
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