You can Enable it by Pressing Alt + Shift + Numlock keys. As soon as you do it, you will be prompt with the below dialog box, Just Click...
- Make Sure your Numlock is Off while you Use keyboard as mouse.
- Done !!! Now you will see MouseKeys icon on your taskbar, which means now you are all set.
- Now talking about the Controllers, Use 8,2,4 and 6 Keys from Numpad to move Up, Down, Left and Right Respectively.
Probably we will have to Use Keyboard as Mouse temporarily and not for long time so one may not prefer to get third party software for this task, but many may do it as it is free and can be helpful.