Problem with the mouse

This is my problem: when I edit any text in WindEdt,
the focus of the mouse is moving all the time.
If I click the mouse in a position in an open text,
the blinking cursor indicating the WinEdt current position
is placed correctly there but, if I click again without
moving at all the mouse, the cursor appears in a different
place (a few lines above).
This is very annoying. In particular, I can't do double-clicking.
It does not depend on the mouse. The touchpad of the laptop
or an external USB mouse do the same.

This behavior only happens when editing  WinEdt texts,
not in other applications (including WinEdt Help).

Has anybody experienced a similar problem?

Thanks,

Paco Lopez

My configuration:
Dell Inspiron 94000, Windows Vista Ultimate


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Francisco J. Lopez Fraguas
Dep. Sistemas Informaticos y Computacion
Fac. Informatica U. Complutense Madrid
Prof. Jose Garcia Santesmases s/n
28040 Madrid
Spain

fraguas <at> sip.ucm.es
Tel: +34 91 3947630
Fax: +34 91 3947529
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Gmane