Use Keyboard As Mouse

 

This is an awesome Trick. If your computer's mouse is not working then this will help you. How? let's see.

Press Alt+Shift+NumLock

Press ok
1,2,3,4,6,7,8,9 are used to move the cursor.

5 is used to single click

+ for double click

Insert key to hold mouse button

Delete button used to release the mouse 

If you want to disable this keyboard mouse so off the numlock button.