If your mouse is not working and you don't wish to wait till you get a new mouse, you would definitely like to know how you can use your keyboard as your mouse. It is easy to use your mouse as keyboard in windows using the On Screen Keyboard utility, but it is also possible to do the reverse.
Windows 8, Windows 7 and Vista Users:
Open Ease of Access Center by clicking the Start button , clicking Control Panel, clicking Ease of Access, and then clicking Ease of Access Center.
Click Make the mouse easier to use.
Under Control the mouse with the keyboard, select the Turn on Mouse Keys check box.