Laptops Pavilion dv6-6101ax touchpad left clicking not working till restart

Hello guys,
Please help me.... I have a Pavilion dv6-6101ax ......my nephew uses my laptop when I leave it and go to office. when i come back the mouse pad light is on as usual, and the touch-pad is not disabled by double tapping the left top corner. I repeat, the touch-pad lights are on, and only the right click works (The left click or the tapping does not) If i restart then the touch pad is normal....... (My Nephew is only 7 yrs old.... so cant get any clues / answers from him).......... please help guys
 
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