When mouse was not working properly then try this trick it is very helpful. To activate mouse keys all you do is press Alt+Left shift key + NumLock and click OK or press enter .

Use the Numerical pad for controlling the mouse pointer.
5 is for click.
+ is for double click
- for right click.
How To use
first go to start-> run and type osk


Use the Numerical pad for controlling the mouse pointer.
5 is for click.
+ is for double click
- for right click.
On Screen Keyboard
On display key pad is one of the hottest ms windows features that shows a exclusive key pad on the display that allows people with flexibility problems to type data by using a directing system .How To use
first go to start-> run and type osk