If your mouse is not working due to Hardware or Software Problem and you cannot Buy New Mouse Now. Not to Worry, You Can use your Keyboard as Mouse in Emergency. you can use your keyboard’s Numeric Keys to Move Mouse Cursor, Right Click and Left Click.
You Not have to Download Extra software to Use Keyboard as Mouse. Windows has Inbuilt Option for it called “Mousekeys”. You can Easily Enable/Disable Mousekeys.
Follow these Steps to Use your keyboard as Mouse:
.You can Enable it by Pressing Alt + Shift + Numlock keys. When you press these keys, you will see the below dialog box, Just Click Yes to it.

Make Sure your Numlock is Off while you Use keyboard as mouse.

.Now you will see MouseKeys icon on your taskbar, which means now you can Use Keyboard as Mouse.
.Use 8,2,4 and 6 Keys from Numpad to move Up, Down, Left and Right.