Use Keyboard as Mouse

When your mouse is not working properly and unlickily you dont have any spare, you can use you keyboard as mouse. Press Left Alt + Left Shift + NumLock and then press Enter on your keyboard.

Now use your Numerical pad for controlling the mouse pointer. Use 5 for click, + for double click and - for right click. Press NumLock again to disable this functionality. (you Numerical pad might be disabled after that Press Left Alt + Left Shift + NumLoack again to enable your Numerical Pad)

Use on-screen Keyboard

If your keyboard isnt working properly and you need to type something urget, then you can use on screen keyboard, which is the built in virtual keyboard of the Windows. To use it click on Start button and click on Start button => Accessories => Ease of Access => On-Screen Keyboard.

Now you can use the virtual keyboard by clicking with mouse.