Strange mouse behaviour

[Jason Crain]

Keith Clark wrote:
> My son must have set something incorrectly but for the life of me I don't
> know what or even how to describe what is happening clearly.
> 
> Within a window, say Firefox, if the left mouse button is depressed, the
> cursor turns into the four arrow keys and the movement of the mouse just
> moves the window.  Just like it would do it the title bar were selected and
> dragged around.  It happens no matter where the cursor is within the
> window.
> 
> Clicking the left mouse button on a menu, like System drop down menu still
> works as normal.
> 
> I hope I've described the problem clearly enough for someone to offer a
> fix.

Is your alt key stuck down?  Try with a different keyboard if you can.