CPU_THERMISTOR: ERROR CODE: 3900:0626__Dell Laptop

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CPU_THERMISTOR: ERROR CODE: 3900:0626__Dell Laptop

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my computer some times suddenly hang and showing graphical scratches, some times not proper shutdown, at the same time hang and showing graphical scratches,  I'm reinstalled  windows XP , but  the same to continue. when i do a diagnostic i get these errors...
"CPU_THERMISTOR: ERROR CODE: 3900:0626" msg: the temperature sensor is out of range at OC
 
i can't understand this error , maybe cooling fan is failed or? so please help me