The scroll lock light appears in the same row as the caps lock light, typically on the top right side of a standard keyboard. This light indicates that the scroll lock, a function that allows a user to use the arrow keys to scroll up, down, left or right without moving the cursor, is enabled. The scroll lock light is typically toggled on and off by means of the "Scroll Lock" button; if the button is worn out or missing, you can disable the light using the onscreen keyboard built into Windows.
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Click "Start" and select "All Programs."
Click "Accessories," then click "Accessibility." Click "On-Screen Keyboard."
Click "ScrLK" to toggle the scroll lock light off. Click the "X" in the top right corner of the onscreen keyboard to exit the program.