Previously I used to know you; This has proved successful in 4736 asphire ACER laptop, with OS Win XP SP3 NASA editions.
Suggestion wrote: toucpadnya reinstall drivers first, there is the possibility of corrupt drivers.
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1. Open the control panel: Start> Control Panel.
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2. Select Printers and Other Hardware.
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3. In the Control Panel option select Mouse icon (no pictures mouse).
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4. Mouse Properties form is displayed (the default on the Buttons tab).
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5. Move to the Device Settings tab position.
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6. Click on the Settings ... button, a new form will appear with the name "Properties for Synaptics Touchpad ......".
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7. Select an option on select items Tapping, on line 2.
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8. Tapping on the form given a check in the Enable Tapping.
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9. Press Apply> OK.
10. OK.
11. Touchpad please try again and see what happens ...
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