From
Use Keyboard as Mouse [How To]
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.
You can also increase the acceleration and speed of your mouse movements according to your needs.
You can alternately press the Alt+Shift+Num Lock combination to instantly activate Mouse keys.
For
laptops, this will only work if your keyboard has a numeric keypad or alternate keys which you can enable by pressing the Number Lock or the Function key.
On
my laptop, number 6 key of the numeric keypad moves the mouse pointer left, number 4 key moves the mouse pointer right, number 2 key moves it down, number 8 key moves the mouse pointer up, number 5 and + key serve as right click while the number 0 key works as left click.
Edit: On second read I see you don't have keyboard input. There is also a virtual keyboard but all require a working mouse or a keyboard to start.
However, did you try an external USB keyboard?