Jumping Curser

While typing a message in gmail or typing in Word, my cursor jumps randomly so that whatever I was typing ends up in a different place than intended. Someone else I know who just switched from XP has the same problem. I'm thinking this happened periodically when I was using Vista as well.

Does anyone know the cause of this problem or more importantly have a fix? I have all the latest MS updates and mouse software updates.

Thank you in advance for your feedback.

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