Some times what happens your mouse don't work properly or forget your mouse at anywhere so you can use keyboard as Mouse...
Following are steps to use keyboard as mouse..
Steps to Use Keyboard as Mouse
Step 1.open "Control Panel" then click on option "Ease of Access Center."
Step 2.next window will open and click on option "Make the keyboard easier to use"
|EASE OF ACCESS CENTER|
Step 3.In this window select option "Turn On Mouse Keys"
now you are able to use numeric key of keyboard as mouse that is it will work as mouse.