Today I discovered a nice feature in Ubuntu which allows you to move the mouse pointer using your numpad’s arrow keys. You can even click using the middle ’5′ button.
However, this can be very annoying if you want to play a game or something, not only because you will have a mouse pointer running around the screen, but also because this feature actually steals the keyboard events, and possibly will cause your program to work improperly.
You can easily disable this feature by going to System -> Preferences -> Keyboard. Then go to the Mouse Keys tab. You will see a checkbox labeled as Allow to control the pointer using the keyboard. All you have to do is to make sure that you have this box unchecked. It should look like this:

This is for Windows Vista, for Windows XP user go to: Control Panel – Accessibility Options – Mouse (TabStrip Index)
and then check the MouseKey (Checkbox), click apply or simply use the shortcut key just hold LEFT ALT + LEFT SHIFT + NUM LOCK.
Note: Use this if your mouse is running funny or malfunction
Robert, this is for Ubuntu. A Linux distribution, not Windows Vista.
robert you are an idiot
You’re all wrong. This is a GNOME desktop function, available to any distro using the GNOME desktop.