I have a less than 3-year-old Dell Studio laptop running Windows 7, Internet Explorer 9. I use the touch pad, not a mouse. Lately the scroll bar moves on its own and the cursor does, too. The cursor bounces all over the place. This is driving me crazy! "I've read some of the answers to this question but I either don't understand what they're talking about or my computer doesn't have the "category" they say to click on.
For weeks the problem was tabs multiplyed exponentially. Then the cursor raced to the end so I couldnt type any thing and the scroll bar plunged to the bottom. It was nuts. I tried everything including replacing Win10. Nothing worked until I replace the driver on the keyboard. As soon as the new driver loaded, problems disappeared.