Dell Inpsiron 560 (Late 2009) - Manual (Page 59)

Navigation Devices (Mouse, Keyboard, Touch Pad)
59
Controlling the Speed of the Scroll Wheel
Windows Vista
®
1 Click Start → Control Panel→ Hardware and Sound→ Mouse.
2 On the Wheel tab in the Mouse Properties window, set the options for
how the scroll wheel on your mouse operates.
3 Click OK.
Windows
®
XP
1 Click Start → Control Panel→ Printers and Other
Hardware
→ Mouse.
2 On the Wheel tab, under Scrolling, select the number of lines to scroll
with each notch on the wheel, or click One screen at a time.
3 Click OK.
Cleaning a Non-Optical Mouse
If your screen cursor (mouse pointer) skips or moves abnormally, clean the
mouse.
NOTICE:
Disconnect the mouse from the computer before cleaning the mouse.
1 Clean the outside casing of the mouse with a cloth moistened with a mild
cleaning solution.
2 Turn the retainer ring on the underside of your mouse counterclockwise,
and then remove the ball.
3 Wipe the ball with a clean, lint-free cloth.