Use your Keyboard as Mouse if mouse is not working >>>

Windows (XP/Vista) has option to work of mouse from Keyboard in case your mouse is not working.

How ?

Work without Mouse

 Press ALT+Shift+Num Lock

 After beep you can see this 

window and press ok/yes

now make Num lock led off

and you can use arrow key to move mouse pointer anywhere on the screen

as

8 for up

2 for down

4 for left

6 for right

when you want to use left key of mouse then use 5

for right key you can use the  key as shown in the picture

Note This Special

The cursor moves very slow but you can speed it up. By pressing ALT+Shift+Num Lock you will see a dialogue click on settings again click settings, and then select Hold down Ctrl to speed up and Shift slow down. Now when you want to move cursor then hold Ctrl and then press any key to move the cursor through numeric keypad. It will speed up now.

Looks Here for the picture for setting mouse key: